invention can be prepared by known methods useful methods are described for example in u s pat no 3 859 092 and by m r collier et al j chem soc dalton 445 1973 for example copper i diorganotellurium ii complexes can be prepared by reacting the proper copper i halide with a diorganotellurium ii compound of the invention in a solution of chloroform or methylene chloride palladium complexes of the diorganotellurium ii compounds of the present invention are conveniently prepared by a substitution reaction by using the appropriate palladium complex which is coordinated to labile ligands useful palladium complexes for this substitution reaction include k 2 pd scn 4 k 2 pdcl 4 k 2 pd c 2 o 4 4 and pdcl 2 ncc 6 h 5 2 a preferred embodiment of the present invention is an image forming combination comprising i the described tellurium ii compound or complex as an oxidizing agent and ii a reducing agent the image forming combination can be in a solvent which can be a nonpolar organic solvent thereby forming a physical developer solution alternatively the image forming combination can be on a suitable support either alone or with other components including light sensitive components other oxidants binders and the like suitable methods of making and using the present image forming combination can be found in copending commonly assigned u s applications ser nos 848.