shamanmoon Posted April 13, 2014 Report Share Posted April 13, 2014 I've been looking on the internet as well as a few books on crystaline glazes but what I'm looking for is a way to add shinny copper sparkles to a glaze over a dark color. Sort of what happens with Crystaline Ultramarine but just the copper sparklies. Thanks Link to comment Share on other sites More sharing options...
PeterH Posted April 13, 2014 Report Share Posted April 13, 2014 Just a ranging shot to fully understand the question. When you say shiny sparkles, and talk about crystalline glazes, I immediately think of aventurines.http://www.qualicer.org/recopilatorio/ponencias/pdf/0062315e.pdfhttp://community.ceramicartsdaily.org/topic/1013-low-fire-aventurine-glaze/Which I believe to be quite tricky, and would expect redox issues would make copper aventurineseven trickier.This picture of a copper aventurine glass clearly shows the attractionshttp://en.wikipedia.org/wiki/File:Goldfluss_%28Aventuringlas%29.jpg... and the associated wiki page indicates some of the difficulties in it's production (and a glass in its tank --unlike a glaze in a kiln -- is more or less isolated from the environmental redox).http://en.wikipedia.org/wiki/Goldstone_%28gemstone%29The wiki entry suggests to me that the matrix of an aventurine glaze will always be dark, as it will still contain some precursor oxide of the crystals (and they always seem to involve the transition elements, which have highly coloured ions).Your request for "just the copper sparklies" suggests that you are after a clear copper aventurine. If so, you may be out of luck. Regards, Peter BTW I'm not familiar with Crystalline Ultramarine. Do you have a reference, which might give a clue as to the mechanism behind the sparkles. Link to comment Share on other sites More sharing options...
Benzine Posted April 14, 2014 Report Share Posted April 14, 2014 I believe there are some "Jewel Brown" recipes floating around out there. That's what it reminds me of. I use a commercial low fire one, in my classroom. I'm quite fond of it. Link to comment Share on other sites More sharing options...
shamanmoon Posted April 14, 2014 Author Report Share Posted April 14, 2014 Thank you both for such speedy answers. Peter, I will read the pdf and see if I understand it. It looks complicated. The glaze I used in class is Amaco Crystaltex CTL-46 Ultramarine Jewel. I don't know what they use to get the little explosions of patina green and sparkley copper. But the wiki photos is the effect I'm looking for. Bezine, I will look around for that glaze recipe. Again, thank you both. Sherman Link to comment Share on other sites More sharing options...
PeterH Posted April 14, 2014 Report Share Posted April 14, 2014 As you are using a Crystaltex glaze, I assume that you know that you can buy the "crystals" separately http://www.bigceramicstore.com/glazes/special-finishes-mattes/amaco-glaze-crystals.html ... although they don't look very sparkly to me. I'm still intrigued by your picture of Crystalline Ultramarine with the copper sparklies. Have you used this glaze, just seen a picture? Can you give me any pointer to it, or say where your picture came from? On a negative note, look at this advertising picture of a commercial Copper Aventurine http://www.bathpotters.co.uk/copper-aventurine-mayco-element-el-121/p3874 ... AFAIK good sparkles require carefully controlled cooling cycles Link to comment Share on other sites More sharing options...
PeterH Posted April 14, 2014 Report Share Posted April 14, 2014 You may also be interested in some of the thread http://cone6pots.ning.com/photo/orange-street?commentId=2103784%3AComment%3A78601&xg_source=activity ... I would start with page 3 Link to comment Share on other sites More sharing options...
shamanmoon Posted April 15, 2014 Author Report Share Posted April 15, 2014 The photo is of a hand built teapot that I made about a month ago. Yes the exterior was painted with CLT-46 after bisking. Unfortunately, the day after coming out of the kiln it split open. My teacher is of the opinion that the wall was too thin, I think I may have over glaze the inside causing stress between the interior and exterior. No I didn't know you could purchase the crystals alone. Attached is another jpeg of the sparkles. Thanks again. Sherman Link to comment Share on other sites More sharing options...
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