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Removing baked enamel from coin
"richard schumacher" wrote in message
... In article . net, "Jonathan_ATC" wrote: If it is "real" enamel, which is kiln-fired glass, laquer thinner won't work. To remove real enamel, one would have to suspend the coin vertically and fire in a kiln until the enamel ran off the coin. But, I doubt the OP has access to a kiln to do this. What is the melting point of 90/10 Au/Ag alloy? How does that compare to kiln firing temperatures? That said, it could be the same kind of coloring you experienced, colored epoxy resin. This COULD be removed by soaking in laquer thinner. I am a metalsmith as a hobby. I have not worked much in enamel, so last night at one of our get-togethers I asked some folks who work in enamel for a living. Yes, you can suspend the coin in a kiln and heat it to the melting point of the enamel and it will just drip right off. Just wanted to clear that up because it was said that would not work. If it is epoxy resin, it will just burn off. That said, I was told that the better way was what was described here, heat it with a torch and quench it and the enamel will pop right off. As for melting points of silver and coin silver: Metal Symbol Melting Point ºF Melting Point ºC Specific Gravity Weight in Troy Ozs/Cu In Silver, Pure Ag 1761 961 10.49 5.525 Silver, Sterling - 1640 893 10.36 5.457 Silver, Coin - 1615 879 10.31 5.430 That said, most people enamel on Fine silver as it has the higher melting point. The melting points of various enamel powders vary some by color due to the additives used to make the colors. However, we know that the enamels will melt and flow at temperatures lower than .999, .925 & .900 silver because we've all seen finely enamelled coins. One such example of these enamelled coins is in the Stacks "The Atlanta Sale" catalog. For explanations of different types of enamel and how they are adherred to coins or other metal, see this site: http://www.itsmagick.com/M/tech2.htm I spent 3 hours last night discussing jewelry and coin enamel with people who do it for a living. Very interesting evening. Jonathan_ATC |
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