Aluminium Sulphate Mordant
Aluminium Sulphate Mordant
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Aluminium sulphate is one of the most widely used mordants in natural dyeing, valued for its ability to produce bright, long-lasting colours on natural fibres. Ideal for use with wool, silk, and other protein-based materials, it helps bind natural dyes to fabric, improving colour retention and wash fastness.
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Aluminium Sulphate Mordant
What is aluminium sulphate used for in natural dyeing?
Aluminium sulphate acts as a mordant, meaning it helps fix natural dyes to fibres. Without it, many plant dyes would fade quickly or wash out entirely.
Is aluminium sulphate safe to use?
When handled correctly, aluminium sulphate is considered relatively safe for dyeing. It’s important to follow standard safety practices, such as wearing gloves and a mask, and avoiding inhalation of fine powders.
Which fabrics work best with aluminium sulphate?
It works best on protein fibres like wool and silk, but can also be used on fibres like cotton when combined with tannins.
How do you use aluminium sulphate as a mordant?
Typically, it is dissolved in hot water and applied before dyeing in a pre-mordant bath, allowing fibres to fully absorb the solution before adding natural dyes.
Safety guidelines
- Wear protective gear - gloves, an apron or old clothing, a dusk mask when handling powders.
- Dedicated equipment - keep tools separate from your kitchen items. Use stainless steel or enamel to prevent reactions or colour modification.
- Ensure the space you’re working is well ventilated.
- Handle mordants and plant dyes with care.
- Dye baths involve hot water, be mindful of burns or spills.
- Dispose of materials responsibly.
We cannot guarantee exact colour results with our natural dye products. Each batch is naturally unique, contributing to the distinctive, handcrafted character of your finished pieces. For best results, we encourage experimentation, as colour outcomes can vary depending on fibre type, mordant used, and water quality.