Gentle cold use mordant for bucket method (weight per liter, not per fiber).
Mordant fit for all fibers.
Make a 2% solution with (at most) 50 °C warm water. That is 20 grams of powder per liter of water.
Making 10 liter mordant (in a plastic bucket):
10 × 20 g = 200 g of Aluminium Triformate are weighed and added to a bucket with warm water. Stir.
For smaller amounts (3-5 liter), the powder is dissolved in warm water (approx. 40-60 ºC) and then topped up with cold water.
The mordant can be used immediately.
Time in the mordant;
At 50ºC 1-2 hours. At room temperature 8 hours.
There is no upper limit for mordanting times, so you could keep your fibre in the bucket and leave it there until you need it.
The next batch of fabric can be mordanted in the same bucket. Times needed will extend each time you use up a bit of the mordant. Top up water if needed.
Safety; Irritating fumes and organic acid vapors may develop when material is exposed to elevated temperatures or open flame, this mordant is not meant to be heated over 50ºC
Use gloves and a face mask when handling fine powders.
Disposal; after use of the mordant what is left is a harmless weak alum and weak formic acid that can by flushed through a soak away or the sewer system.
Aluminium (tri) Formate
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.
WARNING! HARMFUL IF SWALLOWED OR INHALED.
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.