What filters are used to create a sepia toned look when using a colour head with a B&W neg? Can other tones be simulated ie, copper, blue, green etc. I intend to use some out of date fuji crystal archive paper processed in RA4 chemicals.
Yes, you can simluate all sorts of tone on colour paper. I've only done it with BW400CN (chromogenic B&W film), but basically, you make a test print, and then use the normal colour balance procedure to find the appropriate tone on your RA-4 paper: more green = remove magenta, more red = remove M+Y, etc.
Sepia is a slightly red colour shift. B&W negatives may be harder to balance, because they do not have the orange correction layer, though.