Vat Black 29(VAT grey BG) is generally black powder, insoluble in water, dark green in concentrated sulfuric acid, and dark green precipitate after dilution.
TRADE NAME:Vat Grey 6BG,Vat Grey BG
Dyeing depth g/L | 40 |
Dyeing method | IW IN |
Leuco color | Grey |
Leveling property | ▲▲ |
Dead cotton | △ |
Light (Xenon test 1/12) | 6 |
Light (Xenon test 1/1) | 7-8 |
Light (Xenon test 2/1) | 8 |
Dyeing Method | Dyeing Temperature(℃) | VAT Method | VAT Temperature(℃) | Levelness | Others |
B method is most suitable, also can be used C method
|
40~50,TheHighest 70 |
Dry cylinder, full bath |
50~60 |
Good |
— |
Color Fastness | Soping(95℃) | Color Fastness | Rubbing | Ironing
| Bleach resistant | Mercerizing | |||||||
Standard Depth | 1/12 Depth | Sample change | White stained | Sample change | White stained | Dry | Wet | immediately | After 4h | Chlorine bleaching | Oxygen bleaching | Sample change | White stained |
6~7 | 5 | 4~5 | 5 | — | — | — | — | 3~4 | 4 | 4~5 | 4~5 | 4 | 5 |
Mainly used for cotton fabric dyeing, suitable for suspension pad dyeing light gray and polyester/cotton blended fabric two bath process, a few used for cotton direct printing. Also applies to silk, viscose, cotton / viscose, Victoria / cotton blended fabric dyeing, mixed colors good.
1.Reduction of Vat Grey BG for jig dyeing and dyeing of cotton products, the most suitable b method, second law applies to the c. Dry cylinder reduction and full bath reduction can be used, reduction temperature 50 ~ 60 ℃ (b), 15 min enough time, stability time 40 min. As with dry cylinder reduction, also can be used at low temperature.
2.Reduction of cotton fiber of vat grey BG leuco affinity medium, good levelness, dyeing curve as shown in figure 4, 5-46. The dead cotton covered cover ability is poor. After dyeing with high temperature cook soap, soap and bath to make considered additions in sodium perborate can make normal light. Except for jig dyeing, dyeing cotton fabrics mainly used for suspension pad dyeing. Because of its resistance to chlorine bleaching, so it is suitable for color yarn dyed fabric.
3.After finishing with urea formaldehyde resin or cyanoformaldehyde resin, the printing and dyeing fabric of reduced BG gray color becomes slightly lighter and redder.
1. The color fastness of VAT grey BG is slightly poor in mercerization, ironing and soaping. The washing fastness of domestic VAT grey BG is especially poor, with heavy mercerization and redness.The color turns slightly blue after soaping.
2.The reduced grey BG should be stored in a dry and ventilated place under seal.
Vat Black 29 typically offers excellent wash and rubbing fastness (one of the main advantages of vat dyes). Lightfastness can be good but varies with shade depth and substrate; deep navy/black shades generally show better wet-process resistance than light gray shades. Use standardized fastness tests to validate final product performance.
Keep the powder dry and sealed in its original packaging at moderate temperature. Use local exhaust ventilation and dust masks or respirators when handling powder; wear gloves and eye protection. Prevent contamination by storing away from strong oxidizers and acids. Dispose of rinse liquors and spent baths according to local environmental regulations.
Shade depends on O.W.F., substrate, reducing strength and after-treatments. Start with a lab sample series varying O.W.F. (e.g., 0.5%–2.0% on cotton) and adjust reduction time/concentration to fine-tune hue. For blends or prints, trial both two-bath and pad-steam routes to identify the best reproducibility strategy.
Avoid over-oxidation and uncontrolled re-oxidation during fixation; ensure even reduction to prevent streaking. Some vat blacks can show different hues in acid vs alkaline residues — full neutralization and thorough washing are important. If you require chlorine or peroxide bleaching tolerance, confirm performance on samples because fastness to strong oxidizers can vary.
