Name:C.I.Direct Violet 81,C.I.25355
Molecular Structure: Double azo class
Molecular Weight: 1070.88
CAS Registry Number:6661-29-6
Manufacturing Methods : 2-Amino-5-nitrobenzoic acid diazo, in alkaline conditions and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling, and then will the nitro reduction, and will get the amino nitrogen compounds for light accidentally gasification.
Properties and Applications: dark purple. Soluble in water for red light purple, slightly soluble in alcohol. The strong sulfuric acid for blu-ray in red, for purple diluted. The dye solution to join strong hydrochloric acid for purple, have precipitation; Add thick sodium hydroxide solution for red light purple, have precipitation.
|Standard||Acid Resistance||Alkali Resistance||Light Fastness||Soaping||Water|
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