This aryl diamine salt, also known as 1,4-diaminobenzene dihydrochloride, presents as a white to pale yellow crystalline powder. Store in a cool, dark and well-ventilated place at ambient temperatures - this substance is light sensitive. 1,4-Phenylenediamine Dihydrochloride is known to be incompatible with oxidizing agents and should not be stored or handled in their vicinity.