Vat Blue 20 appearance is blue-black powder. Insoluble in water, alcohol; slightly soluble in acetone, chloroform, o-chlorophenol, pyridine and toluene; soluble in tetralin, xylene (red with fluorescent solution). Violet black in concentrated sulfuric acid After dilution, there is a purple-black precipitate. The leuco body formed by the dye in the alkaline powder solution is dark purple, and the acid powder solution is dark red.
Vat Dark Blue BO,Vat Deep Blue BO,Cibanon Blue BOA-Ol
It is Used for cotton fiber dyeing, poor levelness. Widely used in dark blue fabric and polyester/cotton khaki dyeing. The leuco used for hosiery dyeing, in yarn-dyed mainly applied to dyeing yarn. Used for cotton fabric direct printing. Can dye viscose, silk and d/cotton goods. Can also be processed into organic pigment.
Dyeing depth g/L | 30 |
Dyeing method | IN |
Leuco color | Violet |
Leveling property | ▲ |
Dead cotton | ▲ |
Light (Xenon test 1/12) | 5 |
Light (Xenon test 1/1) | 7-8 |
Light (Xenon test 2/1) | 7-8 |
Dyeing method | Dyeing Temperature(℃) | Reduction Method | Reduction Temperature(℃) | Leveling Property | Other properties |
A | 60,MAX90 | Dry cylinder | 55~60 | Normal | Dyed materials are prone to discoloration in case of high temperature and water stains |
Light fastness | soapping(95℃) | Perspiration | Rubbing | Ironing | Bleaching resistant | Mercerized | |||||||
standard depth | 1/12 depth | orginal color changed | white fabric stained | orginal color changed | white fabric stained | Dry | Wet | immediately | 4hafter | chlorine bleaching | oxygen bleaching | orginal color changed | white fabric stained |
7~8 | 5 | 4~5 | 5 | 4~5 | 5 | 4~5 | 2 | 3~4 | 3~4 | 4~5 | 4~5 | 4~5 | 5 |
Vat Blue 20 is applied in its reduced (leuco) soluble form. Typical methods include pad-batch, exhaust (vat) dyeing and vat printing. Standard vat-reduction setups — alkaline buffer plus a reducing agent such as sodium hydrosulfite — are sufficient. Pad-batch gives consistent shade for continuous processing while exhaust vats are used for full-depth dyeing. No unusual equipment is required beyond standard vat-dye handling and oxidation facilities.
Vat Blue 20 has high substantivity for cellulose; on cotton/poly blends it will predominantly color the cellulose fraction. For blended fabrics, expect limited uptake on polyester unless combined with a disperse dye. Careful control of reduction and re-oxidation is essential to avoid migration and achieve even appearance; pre-scouring and appropriate auxiliaries improve levelness.
When properly reduced, fixed and re-oxidized, Vat Blue 20 typically exhibits excellent washfastness and good-to-excellent lightfastness, along with strong rub/crock resistance and good chemical resistance under alkaline or neutral conditions. Final fastness depends on shade depth, dyeing recipe and post-treatments such as soaping and after-washes.
Vat dyeing uses reducing agents and alkaline baths; effluent management is important. Minimize residual reducing agents and neutralize baths before discharge. Follow local regulations for wastewater treatment and worker-safety procedures — provide appropriate PPE and ventilation during reduction and oxidation steps. Where possible, optimize recipes to reduce chemical consumption and improve rinse efficiency.
Yes — lighter shades are produced by lowering dye concentration or using appropriate leveling auxiliaries and process control. For precise shade matching, create a series of lab trials across recipe, liquor ratio and fixation conditions, and prepare standard lab-dip records. Controls for temperature, reduction strength and oxidation time are key to repeatable matches.
