Methylene blue (blue)

Methylene blue - tiazinovy dye, belongs to the class of the main classes. Has low light fastness. Apply to coloring of paper, production of colored pencils, printing paints (in the latter case usually in the form of hydrate of double _{ZnCl2 salt}), to coloring of medicines in microbiology and also as external and internal antiseptics and antidote at poisoning.