I am only making speculative comments on the chemistry. I do not know nearly enough about these coins to judge this one as a forgery or not. Removal to a dry storage storage environment that also excludes the presence or the formation of carbon dioxide certainly would.ĭespite of all of the above, the very first thing I would do is wash the coin in acetone. Verdicare or similar may be of great help. ![]() It takes 12 to 24 hours before the patina will fully develop. Each will achieve different and varying results. ![]() In this case, a condition of self enrichment of the copper in the surface would be unnecessary. Zola Elements Patina Green Brass (plated) Falling Feather Pendant 8x38mm Piece 1-4 0.40 5-9 0.32 10+ 0.21 More Photos & Ideas » Measurements: 1.2mm hole, 1.7mm thick Zola Elements Antique Silver (plated) Celtic Knot Focal Link 40x21mm Piece 1-2 1.60 3-5 1.41 6+ 1. The Patina/Antique Solution can be sprayed, splashed or brushed. The other thing that bothers me is that the vast majority of Spanish milled silver never attains this type of green cast, and this tempts me into thinking that the coin may be a copper rich forgery. Carbon dioxide and alkaline conditions would help promote this storage environment. Patina Plate green MAT Pytka gresowa Patina Plate green MAT Pytka gresowa 2398x1198 Duy format 2398 1198 o produkcie DO POBRANIA Cena katalogowa brutto 419. The copper would have to find some way to surface enrichment, and conditions to arise where hydroxyl and carbonate anions can form or are present. A couple of types of chemistry would need to happen. If that metal corrodes to verdigris, (copper hydroxy carbonate) it would show up as green. 903 fine, so I assume the other parts per thousand are copper metal. It tarnishes easily because of the copper content in the alloy which oxidizes when exposed to air and moisture. If my nemory serves me correctly, these coins were. Sterling Silver: This is a silver alloy comprising 92.5 by weight of silver and 7.5 by weight of other metals, typically copper, zinc and nickel. The coin seems to have the presence of a copper compound of some type in the surface.
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