Vat Blue 29

Preparation

in 45 ~ 50 ℃ with contain 10 ~ 20% of Sulfur trioxide fuming sulfuric acid treatment Cobalt phthalocyanine until 25% be sulfonated (US 2613128).

Properties and Applications

brilliant blue. Dark blue powder. Alkaline reduction leuco for olive, acid reduction leuco for blue-ray olive. In concentrated sulfuric acid to yellow-green, dilute produce blue precipitation. Used for cotton of jig dyeing and yarn dyeing, colour and lustre is gorgeous. Can be directly printed, not suitable for discharge printing. Used to stick/cotton blended dyed, uniform color. Used for silk dyeing, all kinds of depth all can, and can also be used to paper coloring.