CHEMICALS FOR INDUSTRIAL PURPOSES, PRECIOUS METALS SALT FOR INDUSTRIAL PURPOSES, IODIDES FOR INDUSTRIAL PURPOSES, ALKALINE IODIDES FOR INDUSTRIAL PURPOSES; IODINE FOR CHEMICAL PURPOSES, CYANIDES (PRUSSIATES), PRUSSIATES, SILVER SALT SOLUTIONS FOR SILVERING, ION-EXCHANGERS (CHEMICALS), ION EXCHANGERS (CHEMICAL PREPARATIONS), CATALYZER