Hydrates 1 : Chemical salts which contain a certain fixed amount of water in their crystals, e. g. copper sulphate. If copper sulphate crystals (blue) are heated the water is driven off and the crystals become an anhydrous powder (white)
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}