Hydroquinone,
a phenol derivative with the molecular formula
C
6
H
6
O
2
and a molecular weight of 110.11 g/mol, appears as a colorless or white crystalline solid. It's soluble in water, ethanol, ether, and slightly in benzene. Renowned for its skin - lightening ability by inhibiting melanin production, it was commonly used in cosmetics for whitening purposes, yet its application is strictly regulated globally due to potential health hazards like skin irritation and carcinogenic risks. Besides, it serves as a developing agent in photography to reveal images on film and functions as an antioxidant in industrial production to prevent materials from oxidation, also acting as an intermediate in the synthesis of dyes and pharmaceuticals.