What is the chemical structure of Procion MX dye?
Procion MX dyes are described as dichlorotriazine dyes, while Procion H dyes are less reactive monochlorotriazines. Here are the full chemical names and/or structures for several Procion MX dyes. Note the cyclical structure with two chlorine atoms on it: these are the reactive sites that react with -OH groups on the cellulose fiber to create the strong covalent bonds that are responsible for the dichlorotriazines’ extremely high washfastness. Procion H or monochlorotriazine dyes have one, rather than two, of these chlorines, for a similarly strong bond, but higher heat requirements due to their reduced reactivity – which also makes them store well in water, unlike the Procion MX dyes.
