Is Brilliant Blue FCF (E133) Vegan?

Also known as: FD&C Blue No. 1, Acid Blue 9, CI 42090, Blue 1

Vegan

Brilliant blue FCF is vegan. The dye is synthesized from petrochemical aromatics, with no animal ingredient in the molecule or the process. Its history includes the animal safety testing behind every approved synthetic color.

Last checked How we decide

Ingredient Data

Vegan Status

Vegan

E-Number

E133

Also Known As

FD&C Blue No. 1; Acid Blue 9; CI 42090; Blue 1

Source

A synthetic triarylmethane dye made from petrochemical aromatics. Manufacture condenses a benzaldehyde sulfonic acid with two substituted anilines and oxidizes the product to the colored form, isolated as the disodium salt. The dye has no natural source and no animal-derived input.

Commonly Found In

Blue and green sweets, ice cream, slush drinks, sports drinks, icing and cake decorations, canned processed peas, mouthwash, toothpaste, shampoo, and some medicines.

Vegan Alternative

No substitute needed for vegan reasons. Anyone avoiding synthetic dyes can look for spirulina extract, which is the main plant-derived blue in food.

Additional Notes

Brilliant blue is a triarylmethane dye and does not belong to the azo class, so it sits outside the six colors that must carry the EU children's attention warning. Very little of it is absorbed from the gut. Blended with tartrazine (E102) it produces the greens used in sweets and drinks.

In depth

Coal Tar Chemistry, No Animal Input

Brilliant blue belongs to the triarylmethane family. The molecule is built around a central carbon carrying three aromatic rings. Production starts from benzaldehyde and aniline derivatives sourced from petroleum refining, historically from coal tar. The older literature therefore calls these coal tar dyes.

The synthesis condenses the aldehyde with two amine components, then oxidizes the colorless leuco intermediate into the intense blue product. Sulfonate groups make it water-soluble. The finished dye is isolated as a disodium salt and dried to a powder. Aluminum lake versions are precipitated onto alumina for use in fats and coatings.

No animal-derived reagent, carrier, or processing aid appears in any of that. Where a label lists E133 or FD&C Blue No. 1, the color itself is vegan, and the rest of the ingredient list decides the product.

Not One of the Southampton Six

Six food colors must carry the phrase "may have an adverse effect on activity and attention in children" on EU and UK labels: E102, E104, E110, E122, E124, and E129. Brilliant blue is absent from that list. The 2007 Southampton study did not test it.

Chemistry is part of the reason. The six named colors are azo dyes or a quinophthalone dye, while brilliant blue is a triarylmethane. Very little brilliant blue crosses the gut wall, and most of an ingested dose leaves in the feces unchanged.

That difference explains why a blue sweet and a red one from the same bag can carry different label warnings. Neither warning has anything to do with animal content.

Where Blue Comes From When It Is Not Synthetic

Blue is the hardest color to source from plants. Anthocyanins (E163) shift blue only in narrow pH windows and are unstable, and no traditional blue plant pigment survives food processing well.

Spirulina extract, a phycocyanin from blue-green algae, is the main natural alternative and now colors many mainstream sweets, but it degrades with heat, light, and acidity, which limits where it works. The EU treats it as a coloring food, so it carries no E-number, and in the United States the FDA approved it for food coloring in 2013.

Both options are vegan. The choice between them turns on stability and cost. A blue food gives no clue about animal content from its color alone.

Frequently asked questions

Is E133 vegan?

Yes, by composition. Brilliant blue FCF is a synthetic dye made from petrochemical aromatics with no animal-derived ingredient. Vegans who also avoid additives with a history of animal safety testing may choose to skip synthetic colors as a group.

Does E133 carry the children's attention warning?

No. That warning applies to six colors: E102, E104, E110, E122, E124, and E129. Brilliant blue was not part of the 2007 Southampton study behind the rule and is not covered by it.

Is Brilliant Blue the same as Blue 1?

Yes. FD&C Blue No. 1 is the United States name for the same dye that the EU numbers E133. Cosmetic labels list it as CI 42090, and the chemistry is identical across all three names.

What makes green sweets green?

Usually a blend of brilliant blue with a yellow dye, most often tartrazine (E102). Where the yellow half is one of the six warning-labeled colors, the finished green product carries the children's attention warning. The blue does not trigger it.

← Back to Ingredients Submit a correction

Related entries

Acetic Acid

E260

Vegan

Agar

E406

Vegan

Allura Red AC

E129

Vegan

Ammonia Caramel

E150c

Vegan

Ammonium Carbonates

E503

Vegan

Annatto

E160b

Vegan