Mordant - Copper Sulphate

Copper Sulphate is a specialist mordant and colour modifier used in natural dyeing to shift tones and enhance colourfastness. When used in small amounts, it can transform colours toward deeper greens, teals and rich browns, adding depth and complexity to natural dye results. It is most commonly used as an after-bath or modifier, rather than a primary mordant, allowing dyers to fine-tune colour after the initial dyeing process. This makes it particularly useful for achieving subtle tonal variations and more controlled, refined outcomes.

This laboratory-refined grade offers consistent and reliable performance, making it suitable for professional textile applications where precision matters. It can be used on a range of natural fibres including cotton, wool and silk, though care should be taken with quantities to avoid over-modification.

Benefits

• Modifies colours to deeper greens, teals and browns
• Enhances depth and complexity of natural dye results
• Can improve washfastness when used correctly
• Ideal for controlled, subtle colour adjustments
• Consistent, high-quality refined product

Perfect For

• Colour modification in natural dye projects
• Botanical dyeing on cotton, silk and wool
• Advanced studio work and professional workshops

Technical

• High-purity copper sulphate powder for controlled colour modification
• Alters hues and enhances fastness in natural dye work
• Use sparingly (typically 1–2% of fabric weight)
• Can be applied in separate bath or as a post-dye treatment
• Always wear gloves and avoid prolonged skin contact