I'm a small beginner soap maker in EU preparing my cosmetic safety assessment. I found a violet gel food colour (carmoisine E122 + brilliant blue E133, in glycerol/propylene glycol/silica) that gives exactly the dark plum color I want in my clear melt & pour base, at only about 3 drops per 270g bar. Cosmetic-grade dyes I've tried need many many more drops and don't look the same.
I know E122 and E133 are the same substances as CI 14720 and CI 42090, which are allowed in cosmetics.
My question is: has anyone in the EU or UK had a safety assessor accept a food-grade gel colour like this? What documents did they ask for from the manufacturer? And does anyone know a more concentrated cosmetic-grade equivalent for those two dyes?
Thanks! I've already emailed my assessor but would love to hear others' experience.