Hydroquinone, also known as benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula C6H4(OH)2. It has two hydroxyl groups bonded to a benzene ring in a para position. Hydroquinone crystalline powder is a chemical compound commonly used in the production of photographic developers, hair dyes, and rubber products. It is also used as a skin lightening agent in cosmetic products. Hydroquinone works by inhibiting the production of melanin, which can help reduce the appearance of dark spots and hyperpigmentation. However, it should be used with caution as it can cause skin irritation and may increase the risk of skin cancer. It is important to follow proper safety guidelines when handling and using hydroquinone.