Buffered papers typically have a pH between 8.5-9.5 Size the process by which gelatin rosin, starch, or other synthetic substance is added to paper to provide resistance to the absorption of moisture and eliminating ink feather and bleed through. Sizing added to the beater of vat pulp is know as internal sizing. After the sheet is formed it may be either surface sized by brushing on the surface or tub sized by bath immersion. Sulphite sulphite pulp is produced from the wood of coniferous trees. Wood chips are cooked in calcium bisulfate or sodium sulphite, and bleached, producing fairly long strong fibers.
Sulphite pulp is available in a range of grades up to pure alpha cellulose.
It is easy to be confused when discerning archival quality in papers these days. There is now just enough information about paper to make a novice dangerous. One of the main questions about paper that I field is whether a paper is acid free and lignen free. Another is whether a paper is cotton rag. This issue will try to give more information about these and other paper concerns so that you may choose papers to better fit your needs.