Is p-Phenylenediamine banned?
p-Phenylenediamine is permitted by the US FDA. Several countries restrict, warning-label, or have reviewed it for safety concerns. The US has more lenient additive rules than the EU, UK, Canada, and Japan, which is why this ingredient remains widely used here.
Why p-Phenylenediamine is flagged
A potent allergen and sensitizer. Strictly concentration-limited in the EU; less tightly controlled in the US.
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