Thanks for idea about front and back re-ex I try it tomorrow. Here is my today best result irakli.jpg at now I don't like black borders it's dark but not black. Red-brown but not black, and I don't know how to get black bordersI try re-ex 10 min and 20 min and don't see any differences. I think re-ex need to do until paper become pink after that moment re-ex doesn't work.