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Quick answer: Acid Black 1 carries the heavier risk profile. 2-Nitro-p-phenylenediamine is restricted in the EU and allowed in the US; Acid Black 1 is restricted in the EU and allowed in the US.
| Property | 2-Nitro-p-phenylenediamine | Acid Black 1 |
|---|---|---|
| EU status | Restricted | Restricted |
| US status | Allowed | Allowed |
| Risk level | medium | low |
| Banned in | — | — |
| Restricted in | European Union | European Union |
| Category | dye | dye |
| Where it hides | hair dye | hair dye |
2-Nitro-p-phenylenediamine (2-Nitro-p-Phenylenediamine) is a hair-dye colorant.
Acid Black 1 (Acid Black 1) is an azo hair dye.
2-Nitro-p-phenylenediamine: Concentration-restricted in the EU over genotoxicity concerns.
Acid Black 1: Concentration-restricted in the EU.
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