Alum is on of the most commonly used mordants. It will improve wash- and light fastness on any fabric. Alum is called 'the sunny mordant' because it tends to brighten the colours. It will make yellows bright yellow and is a must for bright reds when dyeing with madder.


Recommended WOF 15-20% on protein fibres. Usually should be used in combination of 6% WOF cream of tartar

For mordanting cellulose fibers it is better to use Aluminium Acetate.


It is recommended to have a look at the mordanting and scouring  module available here.


Odourless white granules that dissolve easily in hot water.

Potassium Aluminium Sulfate is an inorganic salt that has no harmfull effects to the environment, pets or humans in small dosages. Potassium alum is considered by the FDA as a generally recognized as safe (GRAS) substance. 




Alum (potassium aluminium sulfate)

  • Storage

    Keep in a tightly closed container, stored in a cool, dry, ventilated area. Protect against physical damage. Maintain a constant temperature not to exceed 24° C. (75° F.).  Containers of this material may be hazardous when empty since they retain product residues (dust, solids); observe all warnings and precautions listed for the product.


    Heath and Safety

    Do not ingest. Do not breathe dust. Wear protective gloves, safety goggles and a dust mask when handling fine dye powders and mordants.




    Environmental Hazards

    Natural dye powders are no environmental concern. Mordants and mordanted dye baths should be disposed in a sensible way according to your local waste disposal laws.





    Low order of acute toxicity. LD 50 - 30g/oral (human) May cause irritation to eyes, skin, and mucous membranes. Ingestion will cause gastric irritation and vomiting. Astringent property may cause tightning of the skin.
    May cause irritation to eyes.


    ECOLOGICAL INFORMATION: No specific data or information available regarding environmental impact. Discharge to aquatic environments should be avoided as it may lead to localised adverse effects. (due

    to pH shift of solution).


    DISPOSAL METHODS: Via authorised/licenced waste disposal contractor to an approved waste disposal site, observing all local and national regulations.

  • Packaging

    Natural dyes and mordants are shipped in a special packaging made from recypcled materials with a re-usable zipper. All materials come with an information sheet.

    Your pouches are shipped in either a flat padded envelope or a cardboard box depending on quantity and size.


    Shipping rates.

    Shipping is according to a flat rate; packages up to 100 grams are shipped with registered mail with a tracking number but is untrackable once it leaves the borders of Israel.


    Packages 100- 500 grams are automatically upgraded to priority shipping called ECO post which is fast, reliable and trackable via the website of Israel Postal Services.


    You will see your total shipping rate in your order.

    At this moment it is not possible to ship your dye materials by EMS.

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All rights reserved, copyright all images and text @Suzanne Dekel/DekelDyes

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