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<p>[QUOTE=&quot;2manybooks, post: 9547111, member: 8267&quot;]It looks like you might be pleasantly surprised to find that much of the discoloration is actually just on the back of the glass, and not directly affecting the print.</p><p><br /></p><p><br /></p><p>This would probably be the best first step (instead of the fumigation I suggested earlier. Sometimes I have better Ideas after sleeping on a problem.) You can just place the paper in strong sunlight for a day.</p><p><br /></p><p>Next step might be &quot;dry cleaning&quot;, using a product such as Dietzgen Skum-X powder or a soot sponge - <a href="https://www.talasonline.com/Dry-Cleaning-Sponge-Dirt-Eraser" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.talasonline.com/Dry-Cleaning-Sponge-Dirt-Eraser" rel="nofollow">https://www.talasonline.com/Dry-Cleaning-Sponge-Dirt-Eraser</a> -&nbsp; You need to carefully brush away any residual eraser bits.</p><p><br /></p><p>I would avoid any spot treating with any type of liquid, as there is the danger of creating &quot;tide lines&quot;. Liquids can solubilize embedded dirt and contaminants and deposit them as discolored rings where the liquid evaporates. This is one of the reasons conservators prefer to treat an entire sheet of paper uniformly, submersed in a bath. Care is taken to control the evaporation process as well.</p><p><br /></p><p>One of the risks in washing an etching or engraving is the potential loss of the plate mark as the paper fibers swell.[/QUOTE]</p><p><br /></p>

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