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Iron Powder - 50gms
Mordant (poisonous) Ferrous Sulphate Heptahydrate
Colour changer. For 100gms of wool, use 3gms of dissolved iron and 6gms of cream of tartar. For 1kg of wool use 31gms of iron and 62gms of cream of tartar.
Use sparingly with wool and not recommended for silk.
Use rubber gloves. Fatal if swallowed.