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<p>[QUOTE=&quot;mirana, post: 10386568, member: 79705&quot;]If the acid was coming from the tissue, then it would be discolored everywhere the tissue was touching. This acid came from the original mat and the tissue just absorbed the acid from the mat and also the backing.</p><p><br /></p><p>The marking around the edges is called an acid burn. I&#039;ve never heard of anyone saying it spreads. It comes from the acidic object itself. So remove that and you shouldn&#039;t have more issues. Further, adding new acid free mats and backing will help because they&#039;re designed to absorb acid themselves and be a barrier.</p><p><br /></p><p>You also have to tape the inside of the frame with acid free tape because wood is a source of acids.</p><p><br /></p><p>I would not trim this. There&#039;s no need. Simply cut a mat opening that covers the damaged areas, if you think that looks better.</p><p><br /></p><p>I would also not use standard acid free tape to mount this. Personally, I would use archival mounting corners and archival mounting strips. That way there is no adhesive on the piece.</p><p><br /></p><p>I never recommend glass float mounting...that is framing between two pieces of glass, unless there is a built in spacer between the object and the glass. Humidity will absolutely wreck an object that is against glass. It causes things to adhere and you cannot remove them without damage. I&#039;ve seen it repeatedly. In fact, just saw it on a couple of antique lithos in a museum last month.[/QUOTE]</p><p><br /></p>

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