This chemical is called Reactive Blue 13, and it can also be named as Procion Blue P 5R. The CAS number of this chemical is 12236-84-9. It is dark blue powder, and its slution is purple light blue. It is pure blue in concentrated sulfuric acid, and brown in concentrated nitric acid. This chemical is used for cotton, viscose fiber dyeing, and it's also used for wool, silk and wool fabrics direct printing, and the dimension of the direct printing of cotton blended fabrics, etc. In addition, this chemical should be stored sealed in the cool and dry place. Don't pull the Reactive Blue 13 into water, because it has damage to the environment.