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Message:: [QUOTE="Orielensis, post: 3962556, member: 96898"]In the past, when I was beginning to collect, I have used Ren Wax with mixed results. Some surfaces certainly looked better after applying it. Yet, sometimes the wax layer also made details and outlines appear less sharp and even seemed to contribute to an outbreak of bronze disease, maybe because of moisture trapped in the coin. The Nero below is an example of the latter two effects. The profile looked sharper before applying Ren Wax. After being treated with this substance, the coin developed a bit of bronze disease around the edges, which I fortunately recognized early on and was able to stop/stabilize with a long bath in an alcoholic benzotriazole solution. The main reason I stopped using Ren Wax is that there doesn't seem to be any way to remove a mycro-crystalline wax layer without inflicting great damage to the coin. Acetone baths etc. won't dissolve it. Since they are irreversible and because I don't know what long term effects they will have, for example whether such coatings might break down, become sticky or change color, I decided to stay away from any mycro-crystalline products. [ATTACH=full]1043652[/ATTACH] Nero, Roman Empire, as, 62–68 AD, Rome mint. Obv: NERO CAESAR AVG GERM IMP, laureate head of Nero right. Rev: S-C, Victory with shield walking left, inscription on shield (SPQR) worn away. 28mm, 11.09g. Ref: RIC I, 312. Ex André Cichos.[/QUOTE]