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Old 07-07-2017, 01:45 PM
Dan Vanantwerp Dan Vanantwerp is offline
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zinc oxide

Going to try a recipe from the forum (Mr. Vanderlaan) which calls for zinc oxide, as follow:

"I have made calcedonia's in cullet in the past but it is difficult in a cullet that is oxidizing in nature. In about eight pounds of actual glass, I would recommend adding 4.6 grams of silver nitrate, 28 grams of zinc oxide and 28 grams of black tin. Then add two grams of red iron which is key to success in this glass. The iron allows for nucleation points in the glass ( places where crystals or colloids like to form). Melt the glass kind of cold- about 2180F. Melt in a neutral environment. When you gather it, allow the gather to really cool down and then reheat it hard in the gloryhole. If it is going to strike, that will make it happen. Repeated heats intensify the color."

US pigments has a normal zinc oxide and a calcinated one. Which would work better in making color?
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Old 07-07-2017, 02:19 PM
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Greg Vriethoff Greg Vriethoff is offline
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I couldn't resist

Not helpful, I know.

https://youtu.be/lLp4DZmPqYE
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Old 07-07-2017, 02:43 PM
Dan Vanantwerp Dan Vanantwerp is offline
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...and no calcedony glass either!

Perfect!
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Old 07-07-2017, 03:22 PM
Josh Bernbaum Josh Bernbaum is offline
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I've just used their (US Pigment) regular ol' zinc oxide for some of my melts, but that was for certain transparent bases. I haven't done any chalcedony but it's so little in the formula you quote here and he says zinc oxide so I'd go with that.
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Old 07-07-2017, 04:48 PM
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The zinc is represented as an opacifier. try it at the least. The black tn is at least equally important. My formulations come from a batch glass, not a cullet but in the earlier years it worked well based in a plate glass cullet which is rich in iron. I'd be inclined to melt low (2200F) or less. It needs the iron, tiny as the amount is.

It may not work of course. There's no guarantees..You have to expect failure and to keep up your search. If it was easy, every one would be doing it.
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Old 07-08-2017, 12:14 AM
David Hopman David Hopman is online now
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Quote:
Originally Posted by Greg Vriethoff View Post
Not helpful, I know.

https://youtu.be/lLp4DZmPqYE
That's exactly what I was going to post.
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Old 07-08-2017, 09:15 PM
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They should restore it and do a 40th. anniversary re-release. Most of it still cracks me up.
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