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Old 11-08-2019, 09:12 AM
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Chalcedony, Silver Opal

I melted a new color this week. It looks pretty good but I would like a little more red tone to it. It is a dark amber in transmitted light. Recipe for 100 pounds Spruce Pine Color Base
300 gm zinc oxide
280 gm black tin
46 gm silver nitrate
20 gm red iron oxide
melted at 2125, taken up to 2260 7 hours after last charge.
Fairly seedy first day, fewer very small seeds second day.

Should I use a little less red iron or less silver nitrate?
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Old 11-08-2019, 11:51 AM
Chris Lowry Chris Lowry is offline
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I really know nothing but the old guys talked about adding sugar to help reduction.
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Old 11-08-2019, 12:46 PM
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Chalcedonias really like potash and really don't like sodium. zinc and black tin are OK silver seems high, iron somwhat low, melt a lot hotter. Neutral flame. Don't add sugar. That glass will be a slight mismatch for SP87

Read the first sentence again.
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Old 11-08-2019, 01:48 PM
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"Chalcedonias really like potash and really don't like sodium". So I assume that means I would need some potash to help it go toward the red instead of browning out.
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Old 11-08-2019, 02:55 PM
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several things can cause the browning. The first I would indeed say is the sodium content which you can't reduce since it's pre mixed. Second would be the excess silver and it's very touchy as to when is too little and too much. In my own formulations, two grams either way makes for a major shift. The batch doesn't need more zinc since the base has lots. Iron can be strange, Too little and it just strikes poorly, Too much and the same thing happens but the non strike is very different.

Also heating and cooling those glasses is really important for the strike. If it is turning amber prior to any reheat, it has probably got too much silver. I can't quite put a finger on it because of the sodium which I avoid so I don't really get to see its influence.
Reds come from adding a remarkably small amount of copper. They strike in the annealer.
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Old 11-08-2019, 05:33 PM
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Neato!

(Seriously. I love this stuff.)
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Old 11-09-2019, 07:46 PM
Larry Cazes Larry Cazes is offline
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Quote:
Originally Posted by Ed Pennebaker View Post
I melted a new color this week. It looks pretty good but I would like a little more red tone to it. It is a dark amber in transmitted light. Recipe for 100 pounds Spruce Pine Color Base
300 gm zinc oxide
280 gm black tin
46 gm silver nitrate
20 gm red iron oxide
melted at 2125, taken up to 2260 7 hours after last charge.
Fairly seedy first day, fewer very small seeds second day.

Should I use a little less red iron or less silver nitrate?
Thats really nice!
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