Methylene Blue, methylthionine chloride or 3,7-bis(dimethylamino)phenothiazin-5-ium chloride is a chemical compound used as a dye and medication for Gram's stain, Wright stain[?], and the treatment of metoxyhemoglobinemia.
... -- officially as Charles I of Spain, although often referred to as Charles V ("Carlos Quinto" or "Carlos V") in Spain and Latin America. He was the son of Philip I ...