Is indigo carmine Blue 1 or Blue 2?
Blue 2. Brilliant Blue is Blue 1. The names are not interchangeable.
Artificial dyes
Blue 2
Indigo carmine, printed in the US as Blue 2.
Matches personal ingredient preferences based on label evidence; not medical, allergy, or dietary safety advice
What the label is naming
Blue 2 is indigo carmine, also called indigotine, E132, and CI 73015. It is less common than Blue 1 but still printed on candies, baked decorations, and some pet-adjacent human snacks. Pet food itself is outside AisleSwap's scope.
Where it hides
Candy shells, colored frostings, and the occasional cereal marshmallow. It may be listed next to Blue 1 when a product mixes both.
Names and codes
- Blue 2
- Indigo Carmine
- Indigotine
- FD&C Blue No. 2
- E132
Aisles to check
- Candy
- Frosting
- Cereal marshmallows
Label-reading tips
- Indigo carmine and indigotine are Blue 2.
- Do not treat a pet-food scan as in scope for V1 even if this dye is present.
Check a label for Blue 2
Paste an ingredient list. This checker looks only for Blue 2. It does not score the rest of the food.
Questions
Does AisleSwap cover pet food dyes?
No. V1 is US packaged groceries for people. A pet-food label should not be read as a supported scan.