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<p>[QUOTE=&quot;verybrad, post: 162047, member: 37&quot;]Foxing is not the same as acidification.&nbsp; Acidification causes overall toning and paper deterioration.&nbsp; Foxing is different.&nbsp;&nbsp; This is from a Wikipedia article and can explain it better than I can:</p><p><i><br /></i></p><p><i>&quot;The causes of foxing are not well understood. One theory is that foxing is caused by a </i><a href="https://en.wikipedia.org/wiki/Fungal" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Fungal" rel="nofollow"><i>fungal</i></a><i> growth on the </i><a href="https://en.wikipedia.org/wiki/Paper" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Paper" rel="nofollow"><i>paper</i></a><i>. Another theory is that foxing is caused by the effect on certain </i><a href="https://en.wikipedia.org/wiki/Paper" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Paper" rel="nofollow"><i>papers</i></a><i> of the </i><a href="https://en.wikipedia.org/wiki/Oxidation" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Oxidation" rel="nofollow"><i>oxidation</i></a><i> of </i><a href="https://en.wikipedia.org/wiki/Iron" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Iron" rel="nofollow"><i>iron</i></a><i>, </i><a href="https://en.wikipedia.org/wiki/Copper" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Copper" rel="nofollow"><i>copper</i></a><i>, or other substances in the </i><a href="https://en.wikipedia.org/wiki/Wood_pulp" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Wood_pulp" rel="nofollow"><i>pulp</i></a><i> or </i><a href="https://en.wikipedia.org/wiki/Cloth" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Cloth" rel="nofollow"><i>rag</i></a><i> from which the paper was made. It is possible that multiple factors are involved. High humidity may contribute to foxing&quot;</i></p><p><br /></p><p><a href="https://en.wikipedia.org/wiki/Foxing" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Foxing" rel="nofollow">https://en.wikipedia.org/wiki/Foxing</a></p><p><br /></p><p>I always thought it was fungal/mildew but apparently new research has not confirmed this.&nbsp; I agree that what we are seeing here is foxing.&nbsp; The areas where there is image loss seem to be insect damage.[/QUOTE]</p><p><br /></p>

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