iron sulphate
An essential product for the recipe for outdoor flour paint, iron sulphate is also used in gardening (anti-moss, prevention of iron deficiency in plants, iron plating, etc.).
Did you know ? In the Middle Ages, monks' ink was made from ferrous sulphate and gall nuts.
Precautions for use: Iron sulphate is an irritant, which can cause redness of the skin. We advise you to handle it with gloves and a mask. Keep out of reach of children, in a closed cupboard, high up, and in a dry place.