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<p>[QUOTE=&quot;kevin McGonigal, post: 3960934, member: 72790&quot;]There have been several posts in the past about the use of a preservative micro-crystalline product that museums use to preserve metal objects, including coins. Its use engenders debate in the numismatic community about its effects, though museums seem to like it. Whether it does actually protect coins from future ravages of time, well, I suppose we will have to wait a few centuries to see if that is so.</p><p><br /></p><p>Also, there are some who believe the use of micro-crystalline can improve the appearance of coins, giving them a smoother, glossy look. I suppose that will be up for debate as well since eye appeal is about as subjective a determination as there can be. In reading about micro-crystalline I have not found any before-and-after pictures, so I decided to take a handful of coins and apply the substance, wait a bit and gently buff the coins with a soft cloth to see if it is possible to discern any difference in appearance.</p><p><br /></p><p>What I found out is that I can see no difference at all with silver coins so I have not included their images here. I tried four low silver billon coins and included below are two of them, the Roman eastern mint Tetradrachmas, and I am not sure if there is any difference. I tried two brass pieces, both Dupondii of Vespasian, and one of the coins is pictured below. The small bronze of Commodus below may also be a brass but I am not sure. I think I may see a slight improvement in appearance there. The Sestertius of Alexander Severus and the bronze As of the same ruler do seem to me to look better as is true of the little Tetricus (or Claudius II) and the Kushan bronze from First century India and the big Follis of Justinian.</p><p><br /></p><p>What I would like readers to do is to take a look at my photos and see if there is any detectable change in the appearances of the coins from before to after the application of the micro-crystalline. Also, for those of you who may have been using this substance for a while, what is your experience with it? Thanks for any input you might have.</p><p>[ATTACH=full]1043326[/ATTACH] [ATTACH=full]1043327[/ATTACH] [ATTACH=full]1043328[/ATTACH] [ATTACH=full]1043329[/ATTACH][/QUOTE]</p><p><br /></p>

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