Direct Brown 43
Name:C.I.Direct Brown 43,C.I.35700
Molecular Structure: Multi-azo class
C.I.Direct Brown 43,C.I.35700,CAS 6471-44-9,1054.93,C44H29N10Na3O12S3
Molecular Formula:C44H29N10Na3O12S3
Molecular Weight: 1054.93
CAS Registry Number:6471-44-9
Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, first in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid coupling, again with phenol coupling, product to diazo, and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid diazo, and Benzene-1,3-diamine coupled to a product matches.
Properties and Applications: dark red light brown. Soluble in water for dark brown. The strong sulfuric acid for purple, diluted for brown. The dye solution to join strong hydrochloric acid darker precipitation; Join into the thick sodium hydroxide solution for brown
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 4-5 | 4 | 2-3 | 3-4 | 3-4 | ||
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