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Post by mohawkpiper on Aug 4, 2021 16:24:16 GMT -6
It has been years and years since I have been doing the crystalline glazes (or any kind of throwing or ceramics), but recently I started doing a little again. Not saying I'm back, but I might be dabbling again.
I know this will likely be lost, or not seen by many, since most ppl moved over to social media to share their work. And that is ok. I never took to the social media platforms and don't see myself doing so any time soon, but I had a piece I wanted to share, so here it is.
It is a regular ol crystalline glaze but the background has an aventurine like quality to it. It glitters in the sunlight. It is by no means an aventurine glaze. I believe it is a product entirely of the firing schedule.
To those that may see this...
enjoy.
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Post by nikolaybg on Aug 5, 2021 7:11:43 GMT -6
thats not your work?
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Post by mohawkpiper on Aug 5, 2021 11:15:44 GMT -6
Oh it is my work. I haven't done any glazing in i believe 5 or 6 years until very recently. I did do a little throwing a few years ago. This pot was thrown three years ago. It is the second glaze firing i have done recently. Photobucket doesn't really work anymore in uploading photos... I'll see if i can find a site to put up a pic of the pot with lid
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Post by mohawkpiper on Aug 5, 2021 11:27:25 GMT -6
Here you go...  This one was in the same firing... I am going to childer's effect it to bring out some whites to match the shell a bit more...  |
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Post by nikolaybg on Aug 6, 2021 1:51:40 GMT -6
I can't see photos  But i think about this demanding effect, was there any iron in the glaze to create hematite crystals? |
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Post by mohawkpiper on Aug 6, 2021 2:40:54 GMT -6
i fixed the links (forgot to make sharable in google photos lol) for the white, sparkly one... no I don't think there is any iron. it is basically your regular ol purple snow glaze found i believe in an article somewhere on the web. I probably altered the frit, zinc, and silica ratios to fit my needs over the years... but just a 3110 fritted glaze with titanium as a colorant and that's it. i think the sparkly came from a high hold... its like, tons of tiny little crystals. but you can't really see them in room lighting. They are very small and the same color as the background. i think they stunted the growth of the regular crystals at a lower temp hold because I had to add 6 hours to the hold times for the firing, because nothing visible was growing. I etched the brown one... it came out more subtle than I imagined and hoped. but I like it still...
These last two glaze firings I did, after taking a few years break, I think I glazed much thicker than I used to years ago. I am still trying to figure it out again. Probably would have been a lot more white if I didn't glaze them so thick.
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Post by nikolaybg on Aug 6, 2021 13:13:42 GMT -6
And is it possible that there are any miniature secondary crystals?
p.s. this may be a stupid question, but I'm a novice.
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Post by mohawkpiper on Aug 6, 2021 14:02:29 GMT -6
no that is a great question! That could be what it is. i’m not entirely sure. They are hard to photograph, but if you look close they are a bit needle like. (probably cant see in the photo.) i know they were there from the early parts of the growth holds because i saw some kind of texture when i took a look (i watch my crystals grow). i assumed it was from a high hold, but it could totally be secondaries. maybe from the titanium? i used to fire this glaze often and don’t recall seeing that before, but the glaze had been sitting in a bucket for 5 years, so maybe that has something to do with it.
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Post by nikolaybg on Aug 8, 2021 9:01:26 GMT -6
If the recipe contains rutile, then iron could rise from there, but if you just use titanium dioxide, it will be a mystery. The other thing that comes to mind is that if you use lithium carbonate, it sometimes crystallizes in the bucket  . Not that this explains the crystals in the glaze, but you can just keep it in mind. And if nothing can explain the miniature crystals, accept that the universe winks at your return to ceramics;). |
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gczop
Full Member
Posts: 202
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Post by gczop on Aug 8, 2021 9:33:41 GMT -6
Greg Good to see your return and your exemplary, inspiring work.G
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Post by mohawkpiper on Aug 8, 2021 22:31:15 GMT -6
thanks g. (gordon, right?)
nicolay, all my notes are in the studio, which is not a part of the house, so when I am on the computer (meaning here the forum) i am doing most of it from memory... which isn't always accurate. But i took a look. its just yur regular ol' purple snow recipe. ferro frit 3110, zinc oxide, silica, titanium (not rutile), and some bentonite and vee-gum for suspension. and i was wrong about when the glaze was made... this one was made about a week ago actually (not 5 years ago, that was some other glazes i fired. The brown one's glaze was from 5 years ago).
no lithium. (But that is good to know.)
I'm guessing either titanium secondaries (if that is a thing), or it is due to the initial high hold. there was about an hour hold at 2040 F (1115 C). the tiny crystals are visible to the naked eye. they are just really small and needly. and a lot of them. i know that isn't crazy high for the hold. but it is higher than I usually do holds at by a good amount.
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Post by nikolaybg on Aug 23, 2021 11:36:19 GMT -6
Since the last fire of one sample, I have had some microscopic crystals that I haven't had before. I got this effect by adding rutile to the usual white crystal glaze. The strange thing is that the microcrystals were obtained in the thicker sample, and the one that was very thin had no crystals.
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