Direct Brown 1
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Direct Brown 1
C.I.Direct Brown 1
C.I.30045
CAS:3811-71-0
Synonymous names:Direct Brown D3G (Mult);Direct Chrome Brown G (KCA);Rifa Direct Brown 3G (RIFA);Rifa Direct Brown 3GS (RIFA)
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Description
C.I.Direct Brown 1
C.I.30045
CAS:3811-71-0
Synonymous names:Direct Brown D3G (Mult);Direct Chrome Brown G (KCA);Rifa Direct Brown 3G (RIFA);Rifa Direct Brown 3GS (RIFA)
Physicochemical Properties: Brown powder. Soluble in water (orange-brown), ethanol, and sparingly in acetone and cellosolve. In concentrated sulfuric acid, it appears as dark reddish-purple to purplish-black, turning brown upon dilution. Partially soluble in concentrated nitric acid (reddish-brown to orange-brown). The aqueous dye solution turns yellowish-brown with 10% sodium hydroxide. Sensitive to hard water.
Applications: Mainly for dyeing cellulose fabrics. Good dye uptake but poor migration. Also used for silk, nylon, leather, and paper.
