Hair bleaching is a product that changes hair color to a lighter, brighter shade. It contains ingredients such as oxygen and hydrogen, which break down melanin molecules in the hair, resulting in a change in hair color.

**Epsom salt** is a chemical compound scientifically known as **magnesium sulfate**, which consists of the elements magnesium, sulfur, and oxygen. It is named after the town of Epsom in England, where it was first discovered. Epsom salt has a crystalline appearance similar to table salt, but is completely different in chemical composition and uses. It has a bitter and unpleasant taste, so it is not used in cooking.