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Quick answer: Diethylene glycol carries the heavier risk profile. Diethylene glycol is banned in the EU and allowed in the US; p-Phenylenediamine is restricted in the EU and allowed in the US.
| Property | Diethylene glycol | p-Phenylenediamine |
|---|---|---|
| EU status | Banned | Restricted |
| US status | Allowed | Allowed |
| Risk level | high | high |
| Banned in | European Union | — |
| Restricted in | — | European Union |
| Category | cmr | cmr |
| Where it hides | toothpaste (contaminant), cosmetics (contaminant) | permanent hair dye, black henna tattoos |
Diethylene glycol (Diethylene Glycol) is a toxic solvent and contaminant.
p-Phenylenediamine is a primary intermediate in permanent hair dye.
Diethylene glycol: Acutely toxic; banned in EU cosmetics and a notorious adulterant.
p-Phenylenediamine: A potent allergen and sensitizer. Strictly concentration-limited in the EU; less tightly controlled in the US.
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