ALIZARIN BLUE S

Preparation

glycerol,3-Amino-1,2-dihydroxyanthracene-9,10-dione and 3-Amino-1,2-dihydroxyanthracene-9,10-dione was heated with sulfuric acid, washed with water and acid precipitation, and its product (C.I. 67410) and then treated with sodium bisulfite (with or without a solvent may be).

Properties and Applications

red light navy blue (complex). Soluble in water, soluble in ethanol. In concentrated sulfuric acid to dark yellow (release Sulfur dioxide), dilution after brown precipitation. Dye aqueous solution to join concentrated hydrochloric acid to red; Join concentrated sodium hydroxide solution for purple.