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Quick answer: Acid Black 1 carries the heavier risk profile. Acid Black 1 is restricted in the EU and allowed in the US; CI 12150 (Solvent Red 1) is banned in the EU and allowed in the US.
| Property | Acid Black 1 | CI 12150 (Solvent Red 1) |
|---|---|---|
| EU status | Restricted | Banned |
| US status | Allowed | Allowed |
| Risk level | low | medium |
| Banned in | — | European Union |
| Restricted in | European Union | — |
| Category | dye | dye |
| Where it hides | hair dye | hair dye |
Acid Black 1 (Acid Black 1) is an azo hair dye.
CI 12150 (Solvent Red 1) (CI 12150) is an azo colorant.
Acid Black 1: Concentration-restricted in the EU.
CI 12150 (Solvent Red 1): Banned in EU cosmetics over azo-amine release.
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