At Arnfield, lime, ferric sulphate and polyelectrolite are added to the water in mixing chambers.

Here, and in Spain, the production process generates ferrous and ferric sulphate for use in water treatment.

If a drop of ferric sulphate (used as a chemical test in mushroom identification) is applied to the mushroom flesh, it will immediately stain dark bluish-green.

The surface tissue turns green upon the application of a solution of ferric sulphate, and yellow with a dilute solution of potassium hydroxide.

This is done through combining ordinary sodium chloride admixed with smaller quantities of sodium sulphate, sodium bisulphate and ferric sulphate, which is then chemically reduced with charcoal in a furnace.

He says that the gold is "roasted with a double weight of salt and three times the weight of misy (ferric sulphates) and again with two portions of salt and one of the stone which is called schiston."

In primary teeth medicaments such as formocresol, Ferric sulphate, and Calcium hydroxide can be used in pulpotomy although the clinical and radiographic success rate of ferric sulphate is higher than the other materials.