Alum (potassium aluminum sulfate) is a soluble metal that is the most common mordant used for natural dyeing, as it produces the clearest, brightest colours. Used since before the 15th century as a mordant, and as early as 1500BC in Egypt as a water purifier, alum continues to have many uses, including in modern day baking powder.
Mordanting your fibres before dyeing is one of the most important steps in natural dyeing. Alum can be used at 10-20% wof.
More information can be found on mordanting in our FAQs.
This is my go-to source for mordants! It sounds so mundane, but from an ergonomics standpoint, the packaging makes this so easy to store, access, and measure. I have has such a delightful time using it. Thank you!
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ischuur
I have ordered from this shop before and it’s always a great experience
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Sheryl
Item arrived quickly despite me ordering close to the holidays. Larger quantity of alum that you can't get at grocery stores if you can get it at all. This will last me through several projects!
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Andrea
I love the packaging for this alum. Being able to reseal it each time I use it is perfect!
