In printing, duplitized stock is exposed with one record on each side, the cyan record being toned a complementary red with a copper ferrocyanide solution, and the red being toned blue/cyan with ferric ferrocyanide solution.
In printing, duplitized stock is exposed and processed with one record on each side. The cyan record is toned a complementary red with a copper ferrocyanide solution, and the red being toned blue/cyan with ferric ferrocyanide solution.