Light Impressions suggests that non-buffered mat board be used for "chromogenic" prints. I assume that they mean type C and R papers where dyes are generated as opposed to Ciba/Ilfochromes where dyes are bleached. At least this is what we u sed to call chromogenic. Another source suggest that it was Ciba/Ilfochromes tha t needed non-buffered mats. Since most "archival" mats, including all of the 8-p ly I can find are buffered, I was wondering if anyone had a more definitive sour ce for mat info. I am printing on Fuji Crystal Archive so I am particularly inte rested in what board to use with that paper.