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Message:: [QUOTE="desertgem, post: 968125, member: 15199"]As I have posted photos before showing toning ( which could lead over time to corrosion ) can be caused by steel staples, I would recommend stainless steel staples if you wish to use them, but tapes are a reasonable substitute. Common 3M transparent tape uses an adhesive that is basically acrylic and polyesters over polyethylene, but it can also contain neoprene could over time breakdown to chloride radicals. Old transparent tape can sometimes show acidic effects on paper and coins. Thus an archival tape that uses non-acidic constituents would be preferred. How about Duck tape?, <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> No , not that type , but this perhaps. acid free-archival.<a href="http://www.amazon.com/Duck-Invisible-Stationery-Finish-00-21064/dp/B000NHW2VU/ref=sr_1_9?ie=UTF8&s=office-products&qid=1281310629&sr=8-9" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.amazon.com/Duck-Invisible-Stationery-Finish-00-21064/dp/B000NHW2VU/ref=sr_1_9?ie=UTF8&s=office-products&qid=1281310629&sr=8-9" rel="nofollow">http://www.amazon.com/Duck-Invisible-Stationery-Finish-00-21064/dp/B000NHW2VU/ref=sr_1_9?ie=UTF8&s=office-products&qid=1281310629&sr=8-9</a>[/QUOTE]