Aluminium Sulphate is used for dyeing protein fibres such as wool and silk. it can be used at 10-15% WOF (weight of fibre). cream of tartar can be used in addition to this mordanting process to assist with the bond of the mordant. it can also be used to mordant cellulose fibres in addition to a tannin bath.


Alum sulphate is considered non-toxic, but working in a ventilated area and wearing a mask and gloves is best practice whilst handling this powder. We recommend keeping any tools used for this process separate from kitchen tools. Alum may be safely disposed of in small amounts via a municipal water system by pouring down the drain.

This material comes in a natural biodegradable cellophane. We recommend transferring this to a glass or plastic jar for long-term storage.