It is a bluish liquid called a light luminescent or optical brightener and consists of special dyes such as colored dyes and is added to detergents or paints in general. One of its most important properties is converting invisible ultraviolet rays into the visible blue spectrum color, which increases the white appearance in a good visual way and makes it more shiny and bright. Buyformula website will teach you the best method for making optical brightener. Formulas are available in PDF format file, that described in technical English language.