examples of anionic dyes include xanthene and oxonol dyes for example rose bengal eosin erythrosin and fluorescein dyes are useful in addition to iodonium and pyryllium ions other compounds of anionic dyes and sulfonium and phosphonium cations are potentially useful as in the case of the cationic dye compoudns useful dye cation combinations can be identified through the weller equation as having a negative free energy selected examples of anionic dye compounds are shown in table 2 u03bbmax ca 570 nm in tmpta in table 2 the symbol u03c6 is used for a phenyl group and the structure str20 is used for str21 table 2______________________________________ u03c6 sub 2 i sup sub 1 str22 str23 str24 str25 str26 str27 str28 str29 str30 u03c6 sub 2 i sup str31 u03c6 sub 3 sup pch sub 2 u03c6 sub 2 str32 u03c6 sub 3 sup pch sub 2 u03c6 str33 ch sub 3 sup so sub 2 str34 str35 str36 u03c6 sub 2 i sup ______________________________________ the most typical example of a free radical addition polymerizable or crosslinkable compound useful in the present invention is an ethylenically unsaturated compound and more specifically a polyethylenically unsaturated compound these compounds include both monomers having one or more ethylenically unsaturated groups such as vinyl or allyl groups and polymers having terminal or pendant ethylenic unsaturation such compounds are well known in the art and include acrylic and methacrylic esters of polyhydric alcohols such as trimethylolpropane pentaerythritol and the like and acrylate or methacrylate terminated epoxy resins acrylate or methacrylate terminated polyesters etc representative examples include ethylene glycol diacrylate ethylene glycol dimethacrylate trimethylol propane triacrylate tmpta.