Is Sulfite Ammonia Caramel (E150d) Vegan?

Also known as: Class IV caramel, Caramel color IV, Soft drink caramel, Acid-proof caramel

Vegan

Sulfite ammonia caramel is vegan. Producers heat plant sugars with sulfite and ammonium salts to make the acid-stable brown used in cola. The reagents are mineral and synthetic, with no animal input.

Last checked How we decide

Ingredient Data

Vegan Status

Vegan

E-Number

E150d

Also Known As

Class IV caramel; Caramel color IV; Soft drink caramel; Acid-proof caramel

Source

Made by heating plant carbohydrates with both sulfite and ammonium compounds. The sugar feedstock is glucose syrup, sucrose, invert sugar, or molasses, usually from corn, wheat, or cane. Sulfite and ammonium salts steer the browning reaction toward a negatively charged, acid-stable color that holds up in carbonated drinks.

Commonly Found In

Cola and other dark soft drinks, iced tea, energy drinks, sauces, soups, confectionery, pet food, some baked goods.

Vegan Alternative

No substitute needed. E150d is vegan.

Additional Notes

E150d is the world's highest-volume food color by weight, almost entirely because of cola. Its negative charge keeps it dispersed in acidic drinks where other caramel classes would drop out. Residual sulfites can carry through into the finished product, so drinks makers watch the 10 mg/kg allergen declaration threshold.

In depth

The Color in Every Cola

Class IV caramel exists because carbonated soft drinks are hostile to most colorants. A cola sits around pH 2.5, spends months on a shelf, and must look identical in the first bottle and the last. Cooking sugar with both sulfite and ammonium compounds produces a colloid with a strong negative charge, which stays evenly dispersed in that environment for the full shelf life.

By tonnage, E150d outsells every other food color on earth. Cola alone accounts for most of it, with iced tea, sauces, and confectionery taking the rest. The carbohydrate that goes in is plant. The sulfite and ammonium salts are mineral and synthetic, and the process is a controlled cook. No animal-derived material appears at any point, which makes cola's color one of the least complicated things about the drink.

Sulfites, 4-MEI, and What Regulators Track

Two byproduct questions follow this class around. Sulfur dioxide residues can survive into the finished caramel, and from there into the drink; EU allergen rules require a declaration once sulfites exceed 10 mg per kilogram in the product as sold, so most cola stays below that line and carries no sulfite warning. People with sulfite sensitivity sometimes react anyway and prefer to avoid Class IV caramel.

The second byproduct is 4-methylimidazole, formed whenever sugar is cooked with ammonium compounds. California listed 4-MEI under Proposition 65 in 2011, and several soft drink manufacturers reformulated their caramel to lower levels for the United States market. EFSA re-evaluated the caramel classes in 2011 and set a group acceptable daily intake of 300 mg per kilogram of body weight per day covering E150a through E150d. Neither issue touches the sourcing question.

Telling the Caramel Classes Apart on a Label

Labels rarely help. EU ingredient lists give either the class number or the words "caramel color," and United States labels almost always use the generic phrase without specifying which of the four classes is inside. A reasonable rule of thumb covers most products. Aged spirits use E150a, beer and soy sauce use E150c, and acidic soft drinks use E150d. E150b, caustic sulfite caramel, appears in some spirits and vinegars. For vegan purposes the distinction does not matter. All four classes start from plant carbohydrate and use mineral or synthetic reagents, so any caramel color on any label is vegan.

Frequently asked questions

Is E150d vegan?

Yes. Sulfite ammonia caramel is made from plant carbohydrate cooked with sulfite and ammonium salts. Every input is plant, mineral, or synthetic, so the color contains no animal-derived material.

Is the caramel color in cola vegan?

Yes. Cola uses E150d, made by browning plant sugars under controlled conditions. The color has no animal origin, and mainstream cola formulations are vegan unless a variant adds something else, such as certain vitamin blends.

Does E150d contain sulfites?

Small residues can remain from manufacture. EU rules require a sulfite declaration once the finished product exceeds 10 mg per kilogram, and most soft drinks fall below that. People with sulfite sensitivity often avoid Class IV caramel as a precaution.

What is 4-MEI in caramel color?

4-methylimidazole is a byproduct formed when sugar is heated with ammonium compounds, so it appears in E150c and E150d. California listed it under Proposition 65 in 2011, prompting some drink makers to reduce it. The compound is a contaminant, not an added ingredient.

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