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