If I were a steady client, I would try and get a consistent proofing system going. Leave it to them to match it on press. Most printing companies spend a lot on proofing systems and because we can measure color, we can usually make a decent simulation of the printing process. Of course it helps if they are able to make the RGB to CMYK conversion too. If not, then the onus is on you and most do not know how to properly color separate for a press.Randy ZauchaARC