White enamel is made by the addition of stannic and arsenious acids to the flux.

Double salts of cerous chloride with stannic chloride, mercuric chloride, and platinic chloride are also known.

Iodine, antimony trichloride, molybdenum pentachloride, ferric chloride, ferric oxide, antimony, tin, stannic oxide and ferrous sulphate have all been used as chlorine carriers.