# Mixing Bowls

Choose mixing bowls by material, largest size and wall shape. Material fixes what a bowl can do besides mixing: steel goes over a pan of simmering water but never in the microwave, while glass microwaves but is heavy. Tall walls keep hand-mixer spray in; wide, shallow ones fold better. Count bowls, not pieces, because lids and gadgets inflate set counts.

## How it works

A mixing bowl holds food while a whisk, spatula or beaters move through it, then has to survive what comes next: heat over a pan, the microwave, the fridge, the dishwasher. Material decides that second part. Stainless steel is light, unbreakable and does not react with acidic food, and it can sit over simmering water, but it cannot go in the microwave. Tempered glass microwaves and goes to the table, but it weighs several times more, most sets stop below 5 quarts, and hand-mixer beaters can scratch it. Plastic is light and cheap but scratches, stains and holds grease. Ceramic is heavy and chips. Copper is kept for whipping egg whites. Shape decides the first part. Tall walls keep hand-mixer spray in the bowl. Wide, shallow walls give a spatula room to fold without knocking the air out. Size decides which jobs fit at all. [1] [2] [6] [17]

| Family | What it is | Suits |
|---|---|---|
| Stainless steel | Thin sheet steel, light and unbreakable; goes over a pan of simmering water and in the dishwasher, never in the microwave. | Most mixing, hand-mixer work and big batches; what restaurant kitchens stock. |
| Glass | Tempered soda-lime or borosilicate glass; microwave-safe and presentable, but heavy, and most sets stop below 5 quarts, though larger single bowls are sold. | Melting butter or chocolate in the microwave, watching dough rise, serving from the bowl. |
| Plastic or melamine | Molded plastic, often with a spout, handle and rubber foot; light and shatterproof but scratches, stains and holds odours. | Pouring batter from a spout, budget sets, and kitchens that want shatterproof bowls. |
| Ceramic or stoneware | Glazed clay; heavy and steady on the counter, prone to chipping at the rim. | Traditional baking and bowls that double as serving pieces. |
| Copper | Unlined copper bowls whose metal helps stabilise whipped egg white. | Meringue and soufflé whites; not general mixing. |

## How an expert narrows the choice

```mermaid
timeline
  section 1 · Material
    glass : ask Bowl weight : skip Steel thickness
    stainless steel : ask Steel thickness, Non-slip base : skip Microwave-safe, Glass type
    plastic or melamine : ask Microwave-safe : skip Works as a double boiler, Glass type, Steel thickness
  section 2 · Largest bowl size
    over 5 qt : ask Bowl weight
  section 3 · Wall shape
    Deep for a hand mixer, or wide for gently mixing by hand?
```

1. **Material.** Light steel, microwavable glass, plastic, or heavy ceramic?
   Material removes the most and fixes two filters at once: steel is never microwave-safe and glass always is. Copper is rare in mass-retail listings and asked for by name.
   If glass: ask Bowl weight; skip Steel thickness.
   If stainless steel: ask Steel thickness, Non-slip base; skip Microwave-safe, Glass type.
   If plastic or melamine: ask Microwave-safe; skip Works as a double boiler, Glass type, Steel thickness.
   Skip if already known: stated material.

2. **Largest bowl size.** Biggest job: dressings, a cake or cookies, or bread and crowd salads?
   Dressings map to under 4 qt, cake or cookies to 4 to 5 qt, bread or crowd salads to over 5 qt. The band edges are ours, from Wirecutter's 3, 5 and 8 qt; bread follows ATK's extra-large proofing line.
   If over 5 qt: ask Bowl weight.
   Skip if already known: stated bowl size, an earlier answer naming bread baking or batch cooking.

3. **Wall shape.** Deep for a hand mixer, or wide for gently mixing by hand?
   Wirecutter and ATK found tall walls contain hand-mixer spray while wide, shallow walls fold and scrape out better; Epicurious confirmed the spray half. Owning a hand mixer leans deep but does not settle it.
   Skip if already known: stated wall shape.

## What to surface

### Material

What the bowl body is made of: stainless steel, glass, plastic or melamine, ceramic, or copper. Material decides what the bowl can do besides hold food. Steel and glass are nonreactive and can sit over simmering water; steel cannot be microwaved, glass can. Plastic cannot be a double boiler and holds stains and grease. Ceramic is heavy and chips at the rim. Wirecutter and ATK tested only steel and glass; Epicurious added a plastic pick. [1] [2] [6] [13] [12]

Values: stainless steel, glass, plastic or melamine, ceramic or stoneware, copper, other (silicone, bamboo, wood).
Question to ask: Light steel, microwavable glass, plastic, or heavy ceramic?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: In the title: 61 of 67 titles on an Amazon search page read 2026-10-25 named a material.
When the title omits it, the photo settles steel, glass and plastic. Record a rubber or plastic coating on a steel bowl separately, because it changes heat use.

### Largest bowl size

The capacity of the biggest bowl in the set, or of the single bowl, in quarts. The largest bowl decides which jobs fit. Wirecutter puts dressings in a 3-quart bowl, hand-mixer cakes and cookies in a 5-quart and potato salad or stuffing in an 8-quart, and calls 4 quarts plenty for baking without a hand mixer. ATK tested only sets with a bowl of at least 4 quarts and calls extra-large bowls, sold up to 20 quarts, great for proofing dough. Most glass sets stop below 5 quarts. [1] [2] [6] [9] [5]

Values: under 4 qt, 4 to 5 qt, over 5 qt.
Question to ask: Biggest job: dressings, a cake or cookies, or bread and crowd salads?

Used as: top-level split, filter, sortable. Data: needs research, backfill cost low. Look for it as: Per-bowl sizes appear in only 25 of 67 Amazon titles; brand pages (Pyrex, Vollrath) list every bowl's quarts.
Read the largest per-bowl capacity from the brand page or the size selector and bin it. Treat stated capacity as approximate: ATK measured one prep-bowl set well under its claim.
Chart: Set size ladder.

### Wall shape

Whether the bowl is deep with tall, steep sides or wide and shallow with gently sloped sides. Tall walls keep hand-mixer and whisk spray in the bowl, and suit proofing dough. Wide, shallow walls give a spatula room to fold, so whipped batters lose less air, and they are easier to scrape out. Wirecutter's genoise rose highest in its wide bowl; ATK leaned shallow; Epicurious picked deep for whipped cream. [1] [2] [3] [4] [6] [9] [11]

Values: deep and tall-sided, wide and shallow.
Question to ask: Deep for a hand mixer, or wide for gently mixing by hand?

Used as: top-level split, filter. Data: needs research, backfill cost low. Look for it as: Rarely stated; a few titles say 'deep'. Brand pages give diameter and height (Pyrex, Vollrath).
Classify from the product photo against reference bowls: wide and shallow like Pyrex's 4-quart and Vollrath's economy bowl, deep like Cuisinart's set and Vollrath 69050. ATK's 'tall and wide' goes with deep (our call). Do not bin on height over diameter: Pyrex's 4-quart and Vollrath 69050 both measure about 0.38.
Chart: Profile silhouette.

### Microwave-safe

Whether the maker says the bowl can go in a microwave oven. Microwaving is the one job steel cannot do, and the main reason testers keep a glass set: melting butter or chocolate, steaming vegetables. Steel is never microwave-safe and glass is. Sources split on plastic: Epicurious says plastic and melamine often can't be microwaved, Wikipedia says melamine bowls are not microwave-safe, and ATK says plastic should not be microwaved at all. So this flag does its work on plastic and ceramic bowls. [2] [7] [6] [19]

Question to ask: Need it to go in the microwave?

Used as: filter. Data: needs research, backfill cost low. Look for it as: In 8 of 67 Amazon titles; otherwise in brand use-and-care lines ('Bowls are dishwasher and microwave safe').
Derive no for steel and copper and yes for glass. Look up plastic, melamine and ceramic bowls on the brand page.

### Non-slip base

A rubber or silicone ring or coating on the bottom that stops the bowl sliding while you whisk. It keeps the bowl still for one-handed whisking, which suits children. The cost: no double boiler, and Wirecutter says the seam between rubber and steel can harbour bacteria and mould. Wirecutter excluded such bowls and suggests a towel ring or a small pot under the bowl instead. [1] [2] [6] [13]

Question to ask: Rubber foot so it stays put, or plain steel?

Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: 'Non-slip silicone base' in 17 of 67 Amazon titles; otherwise visible in the photo.
Read from the title, photo or brand page. Also set it for a plastic-coated exterior (ATK's OXO set), since that rules out a double boiler too.

### Lids included

Whether the set comes with lids that fit each bowl. Lids turn mixing bowls into storage and potluck carriers, and save plastic wrap; ATK and Wirecutter both counted them a bonus rather than a reason to buy. Lids also account for half the piece count in many sets. Pyrex warns its plastic lids are not airtight. [2] [1] [7] [13]

Question to ask: Lids for storing leftovers, or just bowls?

Used as: filter. Data: needs research, backfill cost low. Look for it as: 'with Lids' in 33 of 67 Amazon titles; set contents on brand pages.
Read 'with Lids' from the title. When the title is silent, check the 'set includes' line or photo, because silence does not mean no lids.

### Works as a double boiler

Whether the bowl can sit over a pan of simmering water to melt chocolate or warm eggs. Plain steel and glass bowls can; plastic cannot, and a rubber foot or plastic coating on a steel bowl rules it out. Wirecutter tested each 4- to 5-quart bowl over a 2-quart saucepan; Epicurious melted chocolate in each steel and glass bowl. Pyrex bars direct heat on glass, and a water bath is not direct heat, so glass counts as yes. No source covers copper or ceramic. [1] [2] [6] [7]


Used as: filter, shown on the card. Data: derived from listing fields, backfill cost low. Look for it as: Never stated as such. Needs material plus the non-slip base or coating flag, which titles often omit: ATK lists OXO's steel set as plastic-coated with a rubber base.
Derived from material and the researched non_slip_base flag. Yes for glass, and for steel once the photo or brand page shows no rubber or plastic base or coating; no for plastic and for coated steel; unknown for copper, ceramic and unchecked steel.

### Bowls in the set

How many bowls of any size the set contains, after removing lids, grater discs and gadgets from the piece count. The piece count in the title overstates the set. Pyrex's 8-piece set is four bowls and four lids; Amazon titles sell '26pcs' sets with six bowls. Testers also mark down sets padded with tiny bowls that are 'glorified ramekins'. A set of three, roughly small, medium and large, covers most cooks. [1] [9] [6] [13]


Used as: shown on the card, sortable. Data: needs research, backfill cost low. Look for it as: Piece count is in most set titles, but some titles count bowls only and list attachments on top; the size list or 'includes' line says what the pieces are.
Count the bowls in the size list or 'includes' line. Subtract lids and gadgets from the title count only when that line shows the title counted them. Bundles with grater lids, colanders or measuring cups stay in this leaf; count only their bowls.
Chart: Set size ladder.

### Bowl weight

The weight of one empty bowl, best compared per quart of capacity. Weight decides whether you can hold a full bowl in one hand while you scrape. ATK lists 5-quart steel bowls at 8.6 to 26 ounces and Pyrex's 4-quart glass bowl at 3 pounds 10 ounces. Wirecutter puts what appears to be the same Pyrex bowl at almost 4.5 pounds, and Vollrath's own spec puts its economy bowl heavier than ATK does. Wirecutter says light weight matters most in large bowls. Heavier glass sits steadier. [2] [1] [10] [6]


Used as: shown on the card, sortable. Data: needs research, backfill cost medium. Look for it as: Brand spec tables sometimes give it per bowl (Vollrath); retail titles do not.
Use brand spec tables or reviewer weights for the top 100; otherwise leave blank. The material facet already carries the heavy-glass, light-steel contrast.
Chart: Weight for the size.

### Steel thickness

How thick the sheet steel is, stated as a gauge number (higher is thinner) or as heavy-duty or standard weight. Thin steel dents and its bottom can pop in and out under a whisk, as Wirecutter found with Winco and FineDine; Epicurious also found FineDine flimsy. Thicker steel is steadier but heavier. Wirecutter calls 'standard weight' meaningless between brands, so a gauge or thickness figure is the only comparable number. [1] [6] [10] [11]


Used as: shown on the card. Data: needs research, backfill cost high. Look for it as: Restaurant-supply brand pages state it (Vollrath economy: 26-gauge, 0.016 in). Retail titles say 'thickened' or 'heavy-duty' without a number.
Expect near-zero fill: 3 of 67 Amazon titles mention gauge or 'thickened', and even Vollrath's heavy-duty 69050 page gives no gauge. Look up brand pages for the top 100 steel bowls only; leave blank rather than map 'heavy-duty' to a gauge.

### Rim

Whether the bowl has a wide, outward-rolled rim to hook fingers on, or a narrow rim or none. All three testers rate the rim highly, because it is how you hold a bowl one-handed while scraping or pouring. ATK found glass bowls without a protruding rim slippery and hard to wash. Outward-curved rims also pour more neatly. [1] [2] [4] [6]

Values: wide rolled rim, narrow or no rim.

Used as: shown on the card. Data: needs research, backfill cost low. Look for it as: Seldom in text ('rolled edge', 'beaded edge'); visible in photos.
Classify from the product photo with the vision pass.

### Glass type

Whether a glass bowl is tempered soda-lime glass, the usual US Pyrex, or borosilicate glass. Borosilicate tolerates sudden temperature change better; tempered soda-lime is stronger against knocks and drops, which Wikipedia's sources call the commonest cause of breakage. Pyrex makes both and says the difference is slight. It matters if you pour hot liquid into a cold bowl or move it between fridge and microwave. [8] [18] [2] [20]

Values: tempered soda-lime, borosilicate.

Used as: shown on the card. Data: needs research, backfill cost low. Look for it as: Brand pages and some titles say 'tempered glass' or 'borosilicate'.
Assume tempered soda-lime for US Pyrex and Anchor Hocking unless the page says borosilicate.

## Numbers worth computing

| Metric | Formula | Why |
|---|---|---|
| Mixing bowls per set (bowls) | `count of bowls holding 1 qt or more in the set's size list or 'includes' line` | The title number counts lids, grater discs and gadgets, and sets pad out with prep bowls Epicurious calls 'glorified ramekins'. Pyrex's 8-piece set is four bowls. The 1 qt cut follows Epicurious's smallest useful bowl (1 to 1.5 qt) and ATK's prep bowls of a few ounces. [9] [1] [6] [5] [13] |
| Weight per quart (oz per qt) | `bowl_weight_oz / capacity_qt` | Compares bowls of different sizes on how heavy they are to lift. At 4 to 5 quarts, ATK's listed weights put steel at about 2 to 5 oz per quart and glass at 11 to 15; Wirecutter's Pyrex weight works out near 18, an outlier. [2] [1] |

## What you give up

- Tall walls keep hand-mixer spray in, but you must nearly invert the bowl to empty it and folding takes more strokes, which can deflate a sponge. [1] [2] Board branch: "See more wide, shallow bowls".
- Glass microwaves and serves, but a 4-quart glass bowl outweighs an 8-quart steel one, most glass sets stop below 5 quarts, and Wirecutter says hand-mixer beaters scratch it. [1] [2] Board branch: "See more light steel bowls".
- A rubber foot holds the bowl still, but it cannot go over simmering water and its seam can trap grime. [1] [2] [6] Board branch: "See more plain steel bowls".
- Thin steel is easiest to lift when full, but the cheapest thin sets dent, some straight out of the box. [1] [6]
- Big piece counts usually add lids, gadgets or tiny prep bowls, not mixing capacity. [1] [6] [13] Board branch: "See more sets of three".

## How to draw it

**Set size ladder** (bar, shows Bowls in the set, Largest bowl size). One bar per real bowl, sized by quarts, shows at a glance whether a '12-piece' set has a big bowl or six small ones. This is a proposal, nobody draws it this way yet.

**Profile silhouette** (other, shows Wall shape). A to-scale cross-section shows wall height and flare, which a table of diameter and height does not. This is a proposal, nobody draws it this way yet.

**Weight for the size** (two axis map, shows Bowl weight, Largest bowl size, Material). Capacity against weight, coloured by material, separates light steel from heavy glass and ceramic. This is a proposal, nobody draws it this way yet. [2]

## Words you will meet

- **Nonreactive**. A bowl material that does not give off metal into acidic food such as tomato, vinegar or lemon juice.
- **Double boiler**. A bowl set over a pan of simmering water so its contents warm gently, used to melt chocolate or cook egg mixtures.
- **Folding**. Gently combining a light, whipped mixture with a heavier one using wide spatula strokes so the air stays in.
- **Nesting set**. Bowls of graduated sizes that stack inside each other for storage.
- **Open stock**. Bowls sold one at a time, so you can pick exact sizes instead of a fixed set.
- **Prep bowl**. A small bowl, usually a few ounces, for holding measured ingredients before cooking, not for mixing.
- **Gauge**. A number for sheet-metal thickness where a higher number means thinner metal.
- **Tempered glass**. Glass that is heated and quickly cooled so it resists knocks better and breaks into small pieces.
- **Borosilicate glass**. Glass made with boron that expands little when heated, so it copes better with sudden temperature changes.
- **Melamine**. A hard, molded plastic used for colourful bowls and dishes; it is often not microwave-safe.
- **Leachable lead**. Lead that can dissolve out of a ceramic glaze into food; the FDA sets limits for ceramics used with food.

## Where we made a call

- Material is the first split, because it fixes microwave and double-boiler use before shape or size matter. (confidence high). Wirecutter, ATK and Epicurious all organise their picks by material and state the same steel-versus-glass rules. Ours, built on those. [1] [2] [6]
- Piece count is the generic trap; count real bowls and check the largest size. (confidence high). Pyrex's own spec table, Wirecutter on Luminarc's 10-piece set and Epicurious on 'glorified ramekins' agree; the Amazon titles show lids and gadgets in the count. [9] [1] [6] [13]
- Neither deep nor shallow bowls are better overall; the hand mixer decides. (confidence medium). Sources disagree. Wirecutter and Epicurious chose deep Cuisinart bowls for hand-mixer work; ATK prefers shallow Vollrath bowls; Wirecutter calls the wide Thunder Group bowl most versatile. We make shape a split rather than pick. [1] [2] [6]
- A non-slip base is a trade, not an upgrade. (confidence medium). Sources disagree. Wirecutter excludes rubber-bottomed bowls over hygiene but suggests them for children; ATK and Epicurious praise the stability and note the lost double boiler. We record the base and let the buyer choose. [1] [2] [6]
- Ceramic bowls from commercial makers are fine; decorated folk or flea-market pottery can leach lead. (confidence high). FDA sets lead limits for ceramic food ware, restated in its Food Code for food establishments. Decorative ceramics must say 'Not for Food Use', and FDA warns about brightly glazed traditional pottery. [14] [15] [16]
- Copper bowls help egg-white foam but should not hold acidic food. (confidence high). McGee and colleagues (1984) found copper bowls make whipped egg white harder to ruin. ATK says acid leaches copper into food, and the FDA Food Code bars copper from contact with acidic food such as vinegar or wine. [17] [2] [14]
- Plastic bowls are the weakest everyday choice for whipping egg whites or holding strong colours. (confidence medium). ATK says plastic retains oils and stains; Epicurious says scratches trap fat that ruins egg whites and that tomato and turmeric discolour plastic. [2] [6]
- For plastic bowls, follow the maker's microwave label; ATK would keep plastic out of the microwave altogether. (confidence medium). Sources disagree. Epicurious says plastic and melamine often can't be microwaved, so it varies by product; ATK says plastic shouldn't go in the microwave or hold hot food at all. We filter on the label and show ATK's caution. [2] [6] [19]
- Glass bowls should not take a hand mixer. (confidence medium). Wirecutter says beaters scratch glass and make sudden breakage likelier; Pyrex says not to strike utensils on glass or use it severely scratched. [1] [7]
- Borosilicate and tempered soda-lime glass bowls are close enough that glass type should not filter. (confidence medium). Sources disagree. Pyrex says the differences are slight under its care rules. Consumer Reports, as reported on Wikipedia, found soda-lime bakeware broke more often under thermal shock, in tests run against instructions. [8] [18]

## References

1. [Wirecutter, The Best Mixing Bowls (updated 22 Dec 2025; Internet Archive snapshot 22 Jul 2026)](http://web.archive.org/web/20260722054955/https://www.nytimes.com/wirecutter/reviews/best-mixing-bowls/) (specialist review). Supports: steel and tempered glass are nonreactive and work as double boilers; deep bowls contain hand-mixer splatter; wide bowls fold better; 3, 5 and 8 quart bowls for dressings, cakes and big salads; most glass sets max out at 4 quarts and weigh far more; a 6-quart glass bowl is sold open stock; rubber bottoms excluded over hygiene seam; suggested for kids; standard weight is meaningless between brands; thin bowls dent; Pyrex 8-piece set is four bowls and four lids; beaters scratch glass and make breakage likelier; each 4- to 5-quart bowl tested in a standard 2-quart saucepan.
2. [America's Test Kitchen, The Best Mixing Bowls of 2026 (Sarah Sandler, 6 Mar 2026)](https://www.americastestkitchen.com/equipment_reviews/1538-mixing-bowls) (specialist review). Supports: tested only sets with a bowl of 4 quarts or more; no glass bowl larger than 4.5 quarts found; weights of steel and glass bowls by size; plastic coating and rubber base rule out a double boiler; deep bowls contain splatter but are harder to scrape out; acid leaches aluminium, copper and cast iron; copper ions stabilise egg foam; plastic retains oils and stains; plastic shouldn't go in the microwave or with hot foods; copper mixing bowls are still widely sold; lists OXO steel set as plastic-coated with Santoprene base.
3. [America's Test Kitchen, How to Pick the Best Bowl Shape for the Job](https://www.americastestkitchen.com/articles/6319-choose-right-bowl-shape) (specialist review). Supports: tall narrow bowls for proofing dough and hand mixers; wide shallow bowls need fewer folding strokes and give lighter batter.
4. [America's Test Kitchen, These Mixing Bowls Will Change Your Cooking (17 Feb 2023)](https://www.americastestkitchen.com/articles/6924-vollrath-mixing-bowls) (specialist review). Supports: wide rims are easier to grip; outward-curving rims pour neatly.
5. [America's Test Kitchen, Mini Prep Bowl Sets](https://www.americastestkitchen.com/equipment_reviews/1650-mini-prep-bowl-sets) (specialist review). Supports: one prep-bowl set held well under its stated capacity; most prep-bowl sets hold bowls of a few ounces.
6. [Epicurious, The Best Mixing Bowls](https://www.epicurious.com/expert-advice/the-best-mixing-bowls-product-review-article) (specialist review). Supports: deep Cuisinart bowls kept whipped cream off the counter; rubber grips stop steel bowls being double boilers; plastic and melamine cannot be double boilers and often not microwaved; scratched plastic traps fat that ruins egg whites; sets padded with tiny bowls; aim for one small and two large; FineDine bowls felt flimsy; steel and glass bowls used as double boilers to melt chocolate.
7. [Pyrex, Product Warranties, Safety and Usage](https://pyrexhome.com/pages/product-warranties-safety-and-usage) (spec sheet). Supports: glass: avoid sudden temperature change and direct heat; glass microwave-safe; do not strike utensils or use if severely scratched; Pyrex stainless bowls: do not use in microwave; plastic lids are not airtight.
8. [Pyrex, Frequently Asked Questions](https://pyrexhome.com/pages/frequently-asked-questions) (spec sheet). Supports: soda-lime slightly more impact resistant, borosilicate slightly more thermal-shock resistant; both suit home cooking under care rules.
9. [Pyrex, 8-piece Mixing Bowl Set with Assorted Lids (product page)](https://pyrexhome.com/products/pyrex-8-piece-mixing-bowl-set-with-assorted-lids) (spec sheet). Supports: eight pieces are four bowls and four lids; per-bowl diameter, height and quarts listed; tempered glass, microwave and dishwasher safe.
10. [Vollrath, 5-quart economy stainless steel mixing bowl 47935 (spec page)](https://www.vollrathfoodservice.com/products/smallwares/kitchen-essentials/mixing-bowls/economy-stainless-steel-mixing-bowls/47935) (spec sheet). Supports: 26-gauge steel, 0.016 in thick; 11.5 in diameter, 3.97 in high, 0.65 lb; brand spec fields: diameter, height, thickness, weight, capacity.
11. [Vollrath, 5-quart heavy-duty stainless steel mixing bowl 69050 (spec page)](https://www.vollrathfoodservice.com/products/smallwares/kitchen-essentials/mixing-bowls/heavy-duty-stainless-steel-mixing-bowls/69050) (spec sheet). Supports: heavy-duty 5-quart bowl weighs 1.21 lb against 0.65 lb economy; tall sides and weighting sold as anti-tip.
12. [Mason Cash, Original Cane S12 Mixing Bowl 29cm](https://www.masoncash.co.uk/2001004-cane-s12-mixing-bowl-29cm/) (spec sheet). Supports: earthenware bowls sold by size number; S12 is 29 by 14 cm, 4 litres.
13. [Amazon.com search results for 'mixing bowls', 67 product titles](https://www.amazon.com/s?k=mixing+bowls) (retail listing). Supports: 61 of 67 titles name a material; 25 of 67 titles give a capacity; piece counts include lids, graters and gadgets; 17 titles name a non-slip base; 33 name lids.
14. [FDA Food Code 2022, Chapter 4 Equipment, Utensils, and Linens (county health department copy)](https://www.c-uphd.org/documents/eh/2022-FDA-Food-Code-Chapter-4-Equipment-Utensils-and-Linens.pdf) (regulator). Supports: 4-101.13 restates lead limits for ceramic bowls used in food establishments; 4-101.14 bars copper from contact with acidic food such as vinegar or wine.
15. [21 CFR 109.16 Ornamental and decorative ceramicware (eCFR)](https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-109/subpart-A/section-109.16) (regulator). Supports: decorative ceramics must carry 'Not for Food Use' labels or a bored hole.
16. [FDA, Questions and Answers on Lead-Glazed Traditional Pottery (Internet Archive snapshot 25 May 2026)](http://web.archive.org/web/20260525172102/https://www.fda.gov/food/environmental-contaminants-food/questions-and-answers-lead-glazed-traditional-pottery) (regulator). Supports: improperly fired glaze leaches lead; bright orange, red or yellow traditional pottery is a problem type; commercial everyday ware much less likely to have lead problems.
17. [McGee, Long and Briggs, Why whip egg whites in copper bowls? Nature 308, 667-668 (1984)](https://www.nature.com/articles/308667a0) (academic). Supports: copper utensils reduce the danger of ruining albumen foams by overheating, in the authors' words; mechanism proposed: conalbumin binding copper.
18. [Wikipedia, Pyrex](https://en.wikipedia.org/wiki/Pyrex) (primer). Supports: US Pyrex mostly tempered soda-lime since before 1998; soda-lime stronger against drops; borosilicate better against thermal shock; Consumer Reports 2011 thermal-shock tests ran against instructions.
19. [Wikipedia, Melamine resin](https://en.wikipedia.org/wiki/Melamine_resin) (primer). Supports: melamine utensils and bowls are not microwave safe.
20. [Wikipedia, Tempered glass](https://en.wikipedia.org/wiki/Tempered_glass) (primer). Supports: tempered glass breaks into small granular chunks; nicks or inclusions can cause later spontaneous breakage.