| http://www.w3.org/ns/prov#value | - The hydratable alkali metal salts which may be used in accordance with the present invention comprise the alkali metal salts which form stable hydrates under room conditions, such for example as sodium sulfate, potassium sulfate, sodium carbonate, sodium sesquicarbonate and bicarbonate, lithium perchlorate, the hydratable alkali metal borates such as lithium metaborate and sodium perborate, and th
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