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Quick answer: Both score equally on our risk model. p-Phenylenediamine is restricted in the EU and allowed in the US; Thioglycolic acid is restricted in the EU and allowed in the US.
| Property | p-Phenylenediamine | Thioglycolic acid |
|---|---|---|
| EU status | Restricted | Restricted |
| US status | Allowed | Allowed |
| Risk level | high | high |
| Banned in | — | — |
| Restricted in | European Union | European Union |
| Category | cmr | cmr |
| Where it hides | permanent hair dye, black henna tattoos | perms, hair relaxers, depilatories |
p-Phenylenediamine is a primary intermediate in permanent hair dye.
Thioglycolic acid (Thioglycolic Acid) is a reducing agent in perms and hair removers.
p-Phenylenediamine: A potent allergen and sensitizer. Strictly concentration-limited in the EU; less tightly controlled in the US.
Thioglycolic acid: A corrosive sensitizer; the EU strictly limits its concentration.
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