Potassium Alum 250 gram pack for mordanting wool, cotton, silk & paper  - SAVE £6.50p over the 50 gram price of Alum Mordant.

Potassium alum or potash alum is potassium aluminium sulphate dodecahydrate and our potassium alum is 99% pure and heavy metal free.

Potassium Alum Mordant is weighed and sealed in a polythene bag. The bag is then labelled, placed in a padded envelope and posted to you First Class.