I bought a box of this stuff in 8x10 when it was first released and could never make filters produce any real effect. It always produced a magenta cast - not excessive but annoying. I had a well sorted RA4 processing setup using a roller processor so processing variations were not an issue. In the end I used most of the box for contacts as someone here still does because I thought it was a pretty ordinary B&W paper that was a good idea only in theory. I understand that Kodak, a bit later, released another RA4 chromogenic B&W paper that was better and also one that produced sepia tones. They were only available in rolls and apparently did not last on market very long. OzJohn