| abstract |
THIS INVENTION CONCERNS PRODUCTS AND PHOTOGRAPHIC TREATMENTS USING SILVER HALOGENIDE SOLVENT PRECURSORS OF FORMULAS: (CF DRAWING IN BOPI) IN WHICH R AND R, IDENTICAL OR DIFFERENT, ARE EACH A HYDROGEN ATOM, AN ALKYL GROUP , PHENALKYL, PHENYL OR PHENYL SUBSTITUTED BY AN ELECTRON DONOR OR ELECTRON ATTRACTOR GROUP; R IS AN ALKYL, PHENALKYL, PHENYL OR PHENYL SUBSTITUTE GROUP; Z IS -CN OR -SOR IN WHICH R IS AN ALKYL GROUP WITH BRANCHED CHAIN, PHENALKYL, PHENYL OR SUBSTITUTE PHENYL; AND N IS AN INTEGER NUMBER EQUAL TO 3, 4 OR 5. |