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Quick answer: p-Phenylenediamine carries the heavier risk profile. p-Phenylenediamine is restricted in the EU and allowed in the US; Catechol (pyrocatechol) is restricted in the EU and allowed in the US.
| Property | p-Phenylenediamine | Catechol (pyrocatechol) |
|---|---|---|
| EU status | Restricted | Restricted |
| US status | Allowed | Allowed |
| Risk level | high | medium |
| Banned in | — | — |
| Restricted in | European Union | European Union |
| Category | cmr | cmr |
| Where it hides | permanent hair dye, black henna tattoos | hair dye |
p-Phenylenediamine is a primary intermediate in permanent hair dye.
Catechol (pyrocatechol) (Pyrocatechol) is a hair-dye intermediate.
p-Phenylenediamine: A potent allergen and sensitizer. Strictly concentration-limited in the EU; less tightly controlled in the US.
Catechol (pyrocatechol): A possible carcinogen; restricted in the EU.
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