Vat Black 25Physical Properties and light fastness.
Vat Black 25
Dyeing depth g/L
30
Dyeing method
IN IN spl.
Leuco color
Grey
Leveling property
1`
Dead cotton
2
Light (Xenon test 1/12)
7
Light (Xenon test 1/1)
7-8
Light (Xenon test 2/1)
8
Properties: Brown powder. In concentrated sulfuric acid for green, dilution after black precipitation; In concentrated nitric acid for the red light brown. Alkaline reduction leuco for grey; Acid reduction leuco for dark olive.
Applications: Mainly used in cotton fiber dyeing, generally not used for printing. Suitable for suspension pad dyeing, and other dye spell dyed all kinds of noise, leuco can dye cotton yarn, but also can be used for silk and wool dyeing, and have a good washing fastness and fastness to sunlight.