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#1
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Fine silver surface
I am going to be casting sterling silver rings for enameling. In doing
the homework for this I have found a source from one book that says the surface of the model exits the cast with a layer of fine silver without copper. If this is true, it would eliminate the need of further preparation of the surface to accept the enamel. Anyone have experience with this or know the mechanism envolved? |
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#3
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As always, good information. Thanks Peter. Don Pardoe |
#4
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vj found this in rec.crafts.jewelry, from :
]I have found a source from one book that says the ]surface of the model exits the cast with a layer of fine silver without ]copper. If this is true, it would eliminate the need of further ]preparation of the surface to accept the enamel. Anyone have ]experience with this or know the mechanism envolved? yes, that's basically correct. -- @vicki [SnuggleWench] (Books) http://www.booksnbytes.com (Jewelry) http://www.vickijean.com (Metalsmithing) http://www.snugglewench.com [it's a Callahan's thing] ----------- vj -- pounds metal, mother of three "Js", lives in Paradise,* and is generally considered a smarta$$. Yahoo ID: *vjean95967 |
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#6
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Ted,
I have read about the problems with the transparent enamels and with the reds and decided to begin with Thompson opaque enamels, medium temperature and medium expansion. There is an excellent article at www.glass-on-metal.com by Woodrow Carpenter : Metals Suitable for Enameling. (Peter: forgive me if it is inappropriate to list sites. If so, I hope you will suggest an alternate way to suss out this paper.) There is a lot of useful information in this article, written, I'm guessing, by metallurgists at Thompson. Most interesting to me was the recommendation that enamel on sterling should be fired in a very tight window between 1400 and 1450. This obviously requires one to pick enamels with the firing temperatures and expansions that fit. The reasons for firing 200 degrees below what has in the past been considered the critical temperature are explained in detail. I have decided to stay away from leaded enamels. I suspect one can get intense and beautiful colors this way, but considering the health hazards and the perception of health hazards on rings in constant contact with the finger I chose to start out with Thompson enamels. Another and not insignificant reason is that there's a shop within walking distance of me that sells all the colors and has gone to the trouble of providing fired samples, which I have photographed and loaded on my computer. I am glad to hear some feedback on the difficulty of firing emamels in the round. I suspected it wasn't going to be easy. I am hoping klyr-fire or something of the sort will make it possible. Thanks again for the information. Don |
#7
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In response to Peter's comment on the possibility of other silver
alloys working with enamel, I e-mailed Rio Grande's customer service department asking about their sterling silver anti-firescale casting grain. Their reply was that it does accept enamel without problems. Don. |
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