Toluene-2,5-Diamine
Caution
Official INCI name
A hair-dye ingredient used in place of PPD in many permanent dyes. It's a strong allergen too — many people allergic to PPD react to it. Patch test before every colouring.
What it does
Colorant. Pigments and dyes (often listed as CI numbers).
Worth knowing
Can cause contact allergy that, once developed, returns on every exposure.
Also written as
Scans recognise it under every one of these names.
2,5-DiaminotoluenePTD
“Toluene-2,5-Diamine” is its name in the EU glossary of common ingredient names (no. 28957), the names labels in the EU must use. © European Union, EUR-Lex.