From:  "Diana York / Hawk Meadow Morgans" Date:  Thu Aug 16, 2001  8:46 am Subject:  Paper types/terms Cotton paper is 100% alphacellulose. But 100% alphacellulose paper does not necessary mean 100% cotton. Cotton fiber is naturally very high in alphacellulose (~95-98%) so it takes very little refining to obtain 100% alphacellulose pulp. Wood is usually less than 50% alphacellulose (it also contains lignin and hemicellulose). So wood pulp must be refined and purified much more than cotton in order to obtain a 100% alphacellulose pulp. The sulfite process is one way of purifying wood pulp (involves use of acid). SO according to the description of Legion Photo Matte, it is 100% alphacellulose paper, derived from wood fiber, purified by sulfite process, and buffered to neutral pH. Hope this helps.