Synonyms:

PTDS; 1,4-Benzenediamine, 2-methyl-, sulfate (1:1); 2,5-Diaminotoluene sulfate (1:1); para-Toluenediamine sulfate (1:1); Toluene-2,5-diamine, sulfate(1:1); 2,5-Diaminotoluene sulfate; 2,5-Toluenediamine sulfate (1:1).

Uses:

Primary intermediate in various permanent hair dyes. (CI 76042).

 Allergen of the Year 2025. Alternative hair dye option for up to half of patients with PPD contact allergy.