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Pre-treating yarn with Alum
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Using Citric Acid with Acid Dyes
What is Acid Dyeing? When talking to non-dyers the term Acid Dyeing can fill people with horror. I am presuming it is because people envisage vats of sulphuric acid or something similar. In fact the “Acid” is either citric acid (the same acid produced in lemons and limes) or vinegar. Which one do you use?…