| http://www.w3.org/ns/prov#value | - While any surface-active paper penetrant can be employed, these compounds are know to be especially useful: ethyleneglycol monobutyl ether, ethyleneglycol phenyl ether, diethyleneglycol monobutyl ether, triethyleneglycol monobutyl ether, diethyleneglycol monopropyl ether, dipropyleneglycol monopropyl ether, propyleneglycol monopropyl ether, propylene glycol monobutyl ether, 1,2-butanediol, 1,2 pen
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