Abstract: The present invention relates to a photopolymerizable mixture comprising a compound with at least two terminal ethylenically-unsaturated groups, a boiling point above 100.degree. C. and which is capable of addition polymerization, a polymeric binder, a photoinitiator, and a monoazo dye corresponding to Formula I: ##STR1## R.sub.2 and R.sub.3 are alkyl or alkenyl groups which may be substituted, and R.sub.4 and R.sub.5 are hydrogen or halogen atoms, or alkyl or alkoxy groups.

Abstract: Water-soluble dyestuffs of the general formula ##EQU1## WHEREIN F represents the radical of a water-insoluble anthraquinone dyestuff, X represents an oxygen atom, a sulfur atom or a nitrogen atom which is substituted by a hydrogen atom, a lower alkyl, phenyl, lower acyl or sulfonyl group and Me represents an alkali metal or ammonium ion made by solubilizing insoluble dyestuffs which may be indigo, nitro, azo, imide, anthraquinone, oxazine, thiazine, dioxazine, quinoline, methine, polymethine or phthalocyanine dyestuffs. The water-soluble dyestuffs are adapted to be used in dyeing and printing synthetic fibers and are characterized by the fact that they can easily be converted during the process of dyeing to the original water-insoluble dyestuffs by the influence of heat. They are especially useful for the dyeing of polyester in which material they yield deep dyeings.