| http://www.w3.org/ns/prov#value | - tiator activatable by actinic radiation, characterized in that said layer contains a small amount of a heterocyclic nitrogen-containing compound of the formula n wherein R is an orthoaromatic hydrocarbon nucleus, X is CH NH, S, O, or Se, Z is N or C-Y, wherein Y is H, NH alkyl of one to four carbon atoms, or halogen. 2.
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