dye|World dye variety

Name:C.I.Mordant Brown 42,C.I.58200

Molecular Structure: anthraquinones

C.I.Mordant Brown 42,C.I.58200,CAS 602-64-2,256.21,C14H8O5

Molecular Formula:C₁₄H₈O₅

Molecular Weight: 256.21

CAS Registry Number:602-64-2

Manufacturing Methods : Commonly known as  Anthragallol. (A)3,4,5-Trihydroxybenzoic acid and Benzoic acid and sulfuric acid heated; (b) in the presence of zinc chloride, heating gallic acid and Phthalic anhydride; (c) 2-Hydroxy-1,3-dinitroanthraquinone reduction in strong alkaline solution; (d)1,3-Diamino-2-hydroxyanthracene-9,10-dione and hydrochloric acid heated under pressure.
Note: The product is a free acid state paste; powdery product is sodium

Properties and Applications: Dark brown (chrome). (Sodium salt) was dissolved in water, slightly soluble in o-chlorophenol, (free acid) is insoluble in water, salt is not soluble in acetone, ethanol, benzene, carbon tetrachloride, cellosolve, chloroform, pyridine, toluene. The free acid in concentrated sulfuric acid is brown-red, sodium salt as a brown; diluted brown flocculent precipitate the free acid, sodium salt as an amber.

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