When the Hunt brothers drove up the cost of silver, Kodak launched a 2 pronged effort to conserve silver by R&D. One method involved reducing the actual silver content by over 50% in color papers by means of a proprietary catalytic imaging process. The other involved leaving the silver in a donor sheet that could be returned to Kodak for silver reclamation. Both projects died after a few years, when silver prices went back down. The latter product was called Ektaflex "C" and Ektaflex "R" paper, and was terminated by the Polaroid lawsuit.