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<p>[QUOTE=&quot;2manybooks, post: 400443, member: 8267&quot;]Archival papers come in two basic types, buffered and unbuffered. Both are acid free, meaning they contain no lignin or other acidic products. Most archival papers are also buffered, meaning they have an alkaline material, like calcium carbonate, added so that they have the ability to absorb some acidity from their environment and still remain neutral or above pH. The second type is unbuffered. These papers have a neutral pH, but no added alkaline agent. The general rule of thumb is to use buffered paper to protect objects derived from plant materials (such as paper), but to use unbuffered paper around objects derived from animal materials (such a wool, silk, leather, etc.). Alkaline materials have the potential to harm animal materials over time.[/QUOTE]</p><p><br /></p>

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