Deleted
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Post by Deleted on Oct 15, 2016 19:14:57 GMT -6
I sprayed on a color-stained refractory slip on a few of my pieces, fired it on at ^03 and lightly sanded it fairly smooth. I applied a crystalline recipe I've used before, fired it the same, but the entire vessel was covered with crystals. I wanted more open field without crystals.
My question is what is the best way to address what I believe is called over-nucleation? shorter hold time? higher growing temp?
I will experiment, but wanted some input from the expertise on this forum as a reasonable starting point.
Thanks for any help,
Gabriel
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Kuba
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SztukKilka in Old Formu
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Post by Kuba on Oct 16, 2016 7:05:59 GMT -6
So many things can happen  Try hold more at peak temp or increase peak temp a little. Maybe try to reduce zinc. Unfortunately there is no one answer to this question, especially when You use color slip |
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Post by Deleted on Oct 16, 2016 7:08:50 GMT -6
Thanks Kuba, that does help give me the starting point I mentioned to experiment from.
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Post by mariewright on Oct 16, 2016 19:23:23 GMT -6
Hi Gabriel,
I had the same problem when I started experimenting with crystals over stain. Dialing back the zinc by several percent did the trick for me.
Marie
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Post by Deleted on Oct 16, 2016 20:45:25 GMT -6
Wonderful, Marie. Thanks. :-)
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Post by adammacmillan on Oct 17, 2016 13:14:10 GMT -6
In order of preference -
#1, cut back on the zinc. #2, add a small amount of some flux (lithium, etc.), #3 - longer hold at peak or higher top temp.
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Deleted
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Post by Deleted on Oct 17, 2016 18:28:40 GMT -6
Thank you for the added information, Adam.
By the way, can anyone tell me how hot you can refire a crystalline piece without destroying the crystals?
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Post by mohawkpiper on Oct 18, 2016 0:44:53 GMT -6
Thank you for the added information, Adam. By the way, can anyone tell me how hot you can refire a crystalline piece without destroying the crystals? I did this experiment once a few years ago... i didnt write down notes so i dont know exactly what my findings were but i believe it to be roughly around 2250f. the crystals do not melt back into the glaze as i expected but more discintigrate much like the blocks in the game pong. later i did a post fire reduction at 2000f and the glaze did get a little soft but did not run and the crystals were still fully in tact. i was trying for a sort of dali's clocks look in my crystals, which did not happen. |
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Deleted
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Post by Deleted on Oct 18, 2016 16:26:16 GMT -6
Thanks Greg, that pretty much tells me what I need to know. I have a 15" vase (one of those that is somewhat overnucleated but rather nice) that has a small crack inside the foot ring that I just wanted to fill in with a low-fire glaze without losing the crystals.
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Post by mohawkpiper on Oct 18, 2016 16:51:09 GMT -6
depending on what temp u take the lowfire glaze to and what is in the glaze it may possibly change the color of the glaze but you wont loose the crystals
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Deleted
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Post by Deleted on Oct 18, 2016 17:08:52 GMT -6
I tried "striking" to cone 018 some vases with copper and cobalt carbonates combined in the glaze and in some of the field areas it gave it a slightly smoky tinge, but that hasn't happened to other glazes that didn't combine the Cu and Co.
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Try hold more at peak temp or increase peak temp a little. Maybe try to reduce zinc. Unfortunately there is no one answer to this question, especially when You use color slip 
