prov:value
| - atoms, or hydrogen, M is an alkali metal ion or ammonium ion, Z.sup.?? is an anion, for example a chlorine, bromine, alkyl-sulphate or aralkyl-sulphate ion, n is an integer from 2 to 12 and m' is 0 or 1, the number of groups conferring solubility in water, which can be of the same type or different, being at least sufficiently large to ensure that an adequate solubility in water is obtained, said
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