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Shinny Sparkles In A Glaze

Glaze Copper lowfireglaze

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#1 shamanmoon

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Posted 13 April 2014 - 02:32 PM

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

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#2 PeterH

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Posted 13 April 2014 - 05:34 PM

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....df/0062315e.pdf
http://community.cer...enturine-glaze/


Which I believe to be quite tricky, and would expect redox issues would make copper aventurines
even trickier.

This picture of a copper aventurine glass clearly shows the attractions
http://en.wikipedia....nturinglas).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....tone_(gemstone)

The 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.

 



#3 Benzine

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Posted 13 April 2014 - 08:58 PM

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.


"Anything worth believing, is worth questioning"

#4 shamanmoon

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Posted 14 April 2014 - 09:17 AM

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



#5 PeterH

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Posted 14 April 2014 - 10:32 AM

As you are using a Crystaltex glaze, I assume that you know that you can buy the "crystals" separately

http://www.bigcerami...e-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.bathpotte...nt-el-121/p3874

... AFAIK good sparkles require carefully controlled cooling cycles



#6 PeterH

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Posted 14 April 2014 - 10:38 AM

You may also be interested in some of the thread

http://cone6pots.nin...source=activity

... I would start with page 3



#7 shamanmoon

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Posted 15 April 2014 - 10:54 AM

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

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