Hey all, just a simple question..

I'm float mounting a couple prints for a coming show. My plan is to dry mount the print to an acid free rag board as a pedestal, then attach that board to the backing with linen tape.

Does the backing need to be archival since it's not making contact with the print? The acid free foam boards have a slight yellow hue to them that I don't like since it will be partially showing. Is there any down side to using standard white foam board?