Definition: Methenamine is a chemical compound that is commonly used in pharmaceuticals and cosmetics to create a white or brown color. It is also known as tannin, which is a type of pigment found in many plants. Methenamine can be obtained from various sources such as cocoa beans, mushrooms, or even the bark of certain trees like the one used in the production of tanning oils. Methenamine is primarily used to create an attractive color for cosmetic products and pharmaceuticals by