Pyrogallol, also known as 1,2,3-trihydroxybenzene, is a naturally occurring phenolic compound. It is a white, crystalline solid with a slightly sweet taste and is soluble in water and alcohol. Pyrogallol has been used in various applications for centuries, primarily due to its antioxidant properties. It is commonly found in plants, such as tea leaves and various fruits, and has been used for medicinal purposes, including as an astringent and antiseptic.

In the field of photography, Pyrogallol has played a significant role as a developing agent for black and white films and prints. Its ability to reduce silver ions to metallic silver makes it a crucial component in photographic developers. Pyrogallol-based developers are known for their fine-grain results and excellent image quality. Additionally, Pyrogallol has been used in hair dyes, particularly in the production of natural hair colorants. It helps to fix the dye and enhance its colorfastness.

Despite its various applications, Pyrogallol should be handled with care due to its toxicity when ingested or absorbed through the skin. Protective measures and proper storage are necessary when working with this compound.