Vat Red 41

Vat Red 41 is Orange powder. Insoluble in water. In concentrated sulfuric acid to orange, dilution after deep red precipitation. Alkaline reduction leuco for blue light green; Acid reduction leuco for dark purple.

TRADE NAME:Vat Pink R,Vat Red 5B

Key features

• Appearance: deep red, free-flowing powder suitable for industrial processing
• Fastness: typically excellent wash fastness and good to very good light fastness
• Chemical behaviour: insoluble in water in its oxidized form; becomes soluble after reduction to leuco
• Alkali stability: stable under alkaline vatting conditions commonly used for vat dyes
• Tinting strength: high tinctorial strength — provides deep, saturated shades and good leveling
• Compatibility: compatible with common vat auxiliaries and levelling agents for uniform dyeing

• Storage: long shelf life if stored dry and protected from heat and moisture

Technical Specifications

• ‍CAS NO: 522-75-8
• CI.NO: Vat Red
• Molecular Formula: C16H8O2S2
• Molecular Weight: 296.36
• Shade: Orange Powder‍

Application:

Vat Red 41 Mainly used for cotton, polyester/cotton blended fabric printing and dyeing, good levelness. Cotton is suitable for direct printing, resist printing, color discharge and white. Also can be used for silk and wool dyeing.

FAQ

What makes Vat Red 41 different from reactive or direct red dyes?

Vat Red 41 is a vat dye: it is applied by chemical reduction to a soluble leuco form that enters the fibre and is then oxidized to an insoluble state. This gives far superior wash fastness and migration resistance compared with many reactive or direct dyes that remain chemically bonded at the fibre surface.

How can I get the deepest, most even shades with Vat Red 41?

For deep, even shades, ensure a well-controlled reduction vat and consistent liquor ratio. Use recommended levelling auxiliaries and maintain uniform temperature and pH during reduction and oxidation steps. Proper dispersion of the dye powder and gradual addition to the vat improves leveling on large lots.

Is Vat Red 41 suitable for vat printing and how does it behave in the print paste?

Yes — Vat Red 41 is commonly used in vat printing pastes. In print formulations it should be converted to the leuco form and kept stable until application; after fixation (oxidation) the pigment locks in. Compatibility with the chosen thickener and oxidizing system must be checked to avoid background staining or poor fixation.

How should Vat Red 41 be stored and handled?

Store in a cool, dry place in tightly closed containers to avoid moisture uptake and caking. Avoid exposure to high heat and prolonged sunlight. Use appropriate PPE when handling powder to prevent inhalation and dust formation; follow your workplace SDS for first-aid and spill response.

Can Vat Red 41 be blended with other vat colours for shade customization?

Yes — Vat Red 41 blends well with other vat dyes to expand the shade gamut. For predictable results, perform lab-scale trials to check tinting strength and final fastness, paying attention to any differences in reduction/oxidation behaviour between dyes.