Aluminium Sulfate

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Also known as aluminum sulfate, Aluminiumsulfat (German), aluminiumsulfaat (Dutch), sulfate d'aluminium (French).

Aluminium Sulfate

Aluminium sulfate is an aluminium-based mordant used in natural dyeing and other textile applications. It helps many plant dyes bond more effectively with fibers, improving colour development and durability.

It can be used in carefully tested mordanting processes for both protein and cellulose fibers. Because aluminium sulfate produces an acidic solution, recipes should be tested on a small sample before treating valuable textiles. Always follow a suitable recipe for the fiber and dyestuff being used.

Important distinction

This product is aluminium sulfate, not potassium aluminium sulfate—commonly known as potash alum or simply “alum.” Although both supply aluminium ions, they are chemically different and should not be substituted at the same weight without adjusting the recipe.

How to apply Aluminium Sulfate

Use approximately 8% WOF as a starting point; 8 g of aluminium sulfate for every 100 g of dry fiber.

Dissolve completely in warm water. Add the pre-wetted textile and heat gently for 45–60 minutes without boiling. Allow the bath to cool, then rinse lightly before dyeing.

For cellulose fibers such as cotton and linen, apply after a tannin treatment for improved fixation. Always test on a small sample and adjust the amount according to the fiber, dyestuff and desired result.

Supplied in a plastic container.

Net weight: 250 g
HS code: 2833.22

Safety & handling

For textile dyeing and craft use only. Not for food, cosmetic, medical or household-cleaning use.

Hazard warning: Aluminium sulfate and its acidic solutions can cause serious eye injury and may irritate skin.
Use suitable gloves and tightly fitting eye protection when measuring, dissolving or handling the mordant bath.
Do not release concentrated product or spent baths into drains, soil or waterways.
Keep out of reach of children and pets.
Avoid creating or breathing dust. Measure carefully in a well-ventilated work area and use suitable respiratory protection for fine particulates when dust cannot be avoided.
Wear suitable protective gloves, protective clothing and eye protection. Wash hands thoroughly after handling.
Do not eat, drink or smoke while using this product. Use dedicated tools and containers that will never be used for food.
Store tightly closed, dry, clearly labelled and away from food, drink and incompatible materials.
Eyes: Rinse cautiously with clean water for several minutes. Remove contact lenses if easy to do and continue rinsing. Seek urgent medical advice for persistent irritation, pain or impaired vision.
Swallowed or inhaled: Move to fresh air after inhalation. If swallowed, rinse the mouth and contact a poison centre or medical professional; do not induce vomiting unless instructed.

Important: Follow the package label and the current Safety Data Sheet for the exact product. Formal hazard classification can depend on chemical form, hydration, purity and composition. For the latest safety documentation, contact info@naturaldyestore.com.

Seller and safety contact: Natural Dye Store, Derech HaMaccabim 58, Rishon LeZion, Israel · info@naturaldyestore.com

Avoid breathing dust and prevent contact with the eyes and skin. Wear gloves and eye protection, and work in a well-ventilated area. Keep sealed, cool and dry, away from children. Not intended for food use.