| http://www.w3.org/ns/prov#value | - A mixed carbonate ester of a quinophthalone dye and a tertiary alkanol containing not more than about 9 carbon atoms, preferably a compound of the formula: ##STR1## wherein X is a sulfur atom or a carbonyl group; each Y independently is a hydrogen atom, a halogen atom, a --CO--OR4 or a --CO--NHR4 group, wherein R4 is an alkyl group containing not more than about 10 carbon atoms; R is a hydrogen at
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