Calcium Carbonate Modifier
Calcium Carbonate Modifier
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Calcium carbonate, commonly known as limestone or chalk, is a gentle yet effective additive used in natural dyeing to adjust pH levels and influence colour outcomes. Unlike traditional mordants that bind dye to fibres, calcium carbonate works as a pH modifier, creating a more alkaline environment that can shift and enhance the tones of natural dyes. It is especially useful when working with plant-based dyes where subtle changes in pH can dramatically alter final colours.
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Calcium carbonate
What is calcium carbonate used for in natural dyeing?
Calcium carbonate is used to adjust the pH of the dye bath, helping to influence colour results and improve consistency.
Is calcium carbonate a mordant?
Technically, it is not a mordant. It acts as a pH regulator rather than directly fixing dye to fibres.
Which fibres can be used with calcium carbonate?
It can be used with both cellulose fibres like cotton and linen, and protein fibres such as wool and silk. Care is needed with wool to avoid fibre damage.
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.