I don't think this is necessarily the right place for this question, but it's the closest I could find. Recently I was looking through some mat corners to pick mats for some new prints, and I found two odd things printed on the backs of several corners. First was "100% Cotton Rag," followed by "Buffered to Alkaline pH." I called the manufacturer and they were unable to answer my question about why 100% cotton rag would have to be buffered. The closest they could come was a comment to the effect that high end papers "like an alkaline environment." I called Hahnemule next, and they said "Bullsh#t." Any ideas? This is one of the major manufacturers, and has been my go-to for board, but it sounds like they're pulling something hinky.