| http://www.w3.org/ns/prov#value | - Suitable acids are the monobasic aliphatic carboxylic acids having the structure: ##STR1## wherein n is an integer and 0???n???20 and preferably 0???n???5; R1, R2, R3, R4, and R5 independently are hydrogen, alkyl, alkylene, aryl, aralkyl, alkoxy, carboalkoxy, acyl, acyloxy, and carboxyl with one of the groups R1, R2 or R5 being carboxyl.
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