# C.I. Solvent Red 23

URL: https://app.greenveil.ai/ingredients/ingredient_cas_85_86_9
Categories: beauty, food, industrial, pharma
Functions: colorant, Dye, Fragrance

> C.I. Solvent Red 23 is used as colorant / dye. Greenveil chemical-concern score: 100/100 — Critical concern.. Assessed from 6 sources.

## Safety assessment

- Chemical concern score: 100/100 — Critical concern.
- Confidence: 4
- Rationale: 1-((4-Phenylazo)phenylazo)-2-naphthol (Solvent Red 23; CI 26100) when used as a substance in hair dye products is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

_Assessed by Greenveil._