The work horse of mordants, the oldest and most favoured of mordants used on both protein and cellulose fibres. Mordanting your fibre prior to dyeing improves light and wash fastness and alum is a simple straight forward way to achieve this. To boost performance on cellulose fibres you can repeat the process twice using a fresh bath each time, one process is ample for protein fibres. 10 - 20% WOF Interesting to search Aluminium Potassium Sulphate on Wikipedia for some interesting historical facts.

Alum

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Aluminium Sulphate Powder

The work horse of mordants, the oldest and most favoured of mordants used on both protein and cellulose fibres.

Mordanting your fibre prior to dyeing improves light and wash fastness and alum is a simple straight forward way to achieve this. 

To boost performance on cellulose fibres you can repeat the process twice using a fresh bath each time, one process is ample for protein fibres.

10 - 20% WOF.

 

When working with mordants & modifiers use well ventilated area and face mask.

Alum acetate is a good alternative mordant to use on cellulose fibres compared to Alum. It creates a stronger bond with the fibre thus creating richer more saturated colours on cellulose fibres.

 

Use Alum acetate after your tannin bath. Not recommended for protein fibres.

 

5 - 8% WOF.

 

Alum acetate bath may be kept and re used several times.

 

When weighing and adding to dye bath use well ventilated area and face mask. Alum acetate is a fine powder that can float around when disturbed.

 

Please view our Natural Dyes Instruction Guide for more information.

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Christine Levy
Too much alum?

I followed a recipe that used alum to 10% of dry wool weight , when I finished heating the wool in the alum dilution, thecwool was sticky, it had already been scoured, can you give me any suggestions?what percentage would you recommend?