Vat Green 3

Vat green 3 is Dark gray green powder,Etanol and insoluble in water, soluble in Pyridine . In concentrated sulfuric acid for brilliant yellow green, diluted into olive green. Alkaline reduction leuco as dark blue; Acid reduction leuco for dark brown.

TRADE NAME:Cibanon Olive B-Ol,Vat Olive Green B,Vat Olive Green 2B,Vat Green B

Key properties

• High wash fastness — retains colour through repeated laundering
• Excellent light fastness — resists fading under sunlight
• Superior wet and dry rubbing fastness
• Good levelness when properly reduced and oxidised
• Strong affinity for cellulose fibres after oxidation
• Resistant to common alkalis and many solvents once fixed
• Compatible with standard vating techniques (reduction → exhaustion → oxidation)
• Commercial forms: commonly supplied as powder or paste for industrial dyehouses

Application:

Vat Green 3 Mainly used for dyeing and printing of cotton fiber, can also be used vinylon and cotton blend dyeing, color yield on the PVA slightly deeper, and direct printing. Its leuco or yarn can be dyed cotton knit. Can be dyed with disperse dyes in one bath polyester / cotton blended fabric, polyester component Put a slight color.

Technical Specifications

• ‍CAS NO: 3271-76-9
• CI.NO: 69500
• Molecular Formula: C31H15NO3
• Molecular Weight: 449.46
• Shade: Deep green‍

How is VAT Green 3 typically applied in a textile mill?

VAT Green 3 is applied by reducing the dye to its soluble leuco form (using standard reducing agents and alkali), exhausting it onto the cellulose fibre, and then oxidising the fibre to regenerate the insoluble dye. Common industrial routes include jigger/batch vatting, pad-batch, and winch/vat processes depending on fabric and mill setup.

Which fibres and substrates are best suited for VAT Green 3?

It gives best performance on cellulose fibres — cotton, viscose and their blends. After fixation it also performs well in mixed constructions where cellulose is the dominant component. It is not a first-choice dye for polyester or nylon unless a specific carrier or post-treatment system is used.

How does VAT Green 3 behave with common finishing and washing treatments?

Once oxidised and fixed, VAT Green 3 exhibits strong resistance to washing, perspiration and many standard finishing chemicals. However, harsh oxidative bleaches or aggressive solvent treatments can affect shade — test final processes on sample swatches before bulk finishing.

Can VAT Green 3 be blended with other dyes to modify shade?

Yes — it is often blended with other vat or indigo-type dyes to fine-tune hue or depth. Blending with substantive direct or reactive dyes is possible for toptones but may change fastness properties; always trial blends and retest fastness to ensure the final system meets requirements.

Are there special handling or safety concerns for vatting VAT Green 3?

Vatting requires reducing agents and alkali; handle reducers and caustics with standard PPE (gloves, goggles, ventilation). Avoid releasing reducing baths and spent alkaline solutions without proper neutralisation and wastewater treatment. Follow your SDS and local regulations for storage and disposal.