| http://www.w3.org/ns/prov#value | - The water soluble salts can take the form of sodium or potassium sulfates or chlorides, preferably the sulfates, while the hydroxy alcohols can be selected from glycerol, alkylene glycols in which the alkylene group contains from 2 to 8 carbon atoms, such as ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, sorbitol and the like.
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