|
Post by 1dave on Dec 6, 2013 12:40:22 GMT -5
When molten silver cools to the proper temperature, it begins crystallizing.
Here it is being melted on charcoal.
|
|
|
Post by Pat on Dec 6, 2013 15:42:01 GMT -5
Hmmm, with sterling, all I've seen is oxidation on it after the ball stage. I use fine silver for making balls. and there is no visible oxidation. I have scrap sterling. Do you know what the fuel was?
If he saw impurities on the top, doesn't sound like he pickled it first. Could casting flux? (the magic powder) get rid of the impurities here?
I"m going to try this.
|
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Dec 6, 2013 16:42:28 GMT -5
Pat the charcoal burning will use up all the oxygen locally, so oxidation wont be a problem. My guess anyway.
|
|
|
Post by 1dave on Dec 7, 2013 11:26:33 GMT -5
Notice the charcoal burning around it. I think that kept the temperature up to the crystallizing point for a while. When it cooled below that point it solidified.
|
|
|
Post by Pat on Dec 7, 2013 12:17:21 GMT -5
I tried this yesterday with butane in torch that gets to 2600 degrees on charcoal block. Didn't work. I suspect it was not hot enough. Will try propane next.
|
|
|
Post by Rockoonz on Dec 7, 2013 12:50:03 GMT -5
When I tried the link I got a trojan alert
|
|
|
Post by 1dave on Dec 7, 2013 13:18:25 GMT -5
When I tried the link I got a trojan alert I just tried it and had no problem
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
|
Post by jamesp on Dec 7, 2013 14:16:19 GMT -5
I wonder if it has another metal causing that? Usually slow cooling is a good habitat for growing crystals. That's unusual. Cool.
|
|
|
Post by 1dave on Aug 22, 2020 8:55:09 GMT -5
When I tried the link I got a trojan alert I just tried it and had no problem I'm still curious. Perhaps if you could keep it warm longer . . .
|
|
RWA3006
Cave Dweller
Member since March 2009
Posts: 4,170
|
Post by RWA3006 on Aug 22, 2020 9:29:10 GMT -5
I also wonder how it would respond if it were shielded by inert gas like how we do shielded welding.
|
|
|
Post by 1dave on Aug 22, 2020 9:39:39 GMT -5
I also wonder how it would respond if it were shielded by inert gas like how we do shielded welding. How about melting the silver in a solubal mineral like calcite or salt? This would be a fun experiment for jamesp with his oven.
|
|
RWA3006
Cave Dweller
Member since March 2009
Posts: 4,170
|
Post by RWA3006 on Aug 22, 2020 10:41:14 GMT -5
I also wonder how it would respond if it were shielded by inert gas like how we do shielded welding. How about melting the silver in a solubal mineral like calcite or salt? This would be a fun experiment for jamesp with his oven. Reminds me of articles I've read about how silver forms underground in natural state.
|
|