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changing glaze results?


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#1 missholly

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Posted 23 March 2013 - 10:48 AM

my studio is in my garage, and i live in ohio and it gets cold.
some of the glazes that ive made have changing results.
could this be from the cold?

seems as though at first, the glazes work fine.
i always make sure they are thoroughly mixed and strained before i use them.
now im getting different results.
sometimes they bubble, sometimes they come out matte instead of glossy.
should i be storing these inside where its a bit warmer?
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#2 Pres

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Posted 23 March 2013 - 10:51 AM

my studio is in my garage, and i live in ohio and it gets cold.
some of the glazes that ive made have changing results.
could this be from the cold?

seems as though at first, the glazes work fine.
i always make sure they are thoroughly mixed and strained before i use them.
now im getting different results.
sometimes they bubble, sometimes they come out matte instead of glossy.
should i be storing these inside where its a bit warmer?


Freezing glazes will change them. May I assume these are commercial glazes? Create a storage box with some sort of heat source for in the shop. A light bulb etc. Make certain the heat source is safe. Otherwise store them in the house. If not commercial, use up in Fall, remake in Spring.

Simply retired teacher, not dead, living the dream. on and on and. . . . on. . . .                                                                                 http://picworkspottery.blogspot.com/


#3 OffCenter

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Posted 23 March 2013 - 11:05 AM


my studio is in my garage, and i live in ohio and it gets cold.
some of the glazes that ive made have changing results.
could this be from the cold?

seems as though at first, the glazes work fine.
i always make sure they are thoroughly mixed and strained before i use them.
now im getting different results.
sometimes they bubble, sometimes they come out matte instead of glossy.
should i be storing these inside where its a bit warmer?


Freezing glazes will change them. May I assume these are commercial glazes? Create a storage box with some sort of heat source for in the shop. A light bulb etc. Make certain the heat source is safe. Otherwise store them in the house. If not commercial, use up in Fall, remake in Spring.


I keep my glazes outside (middle Georgia) and even though they never freeze solid, they do freeze several times during the winter and I haven't noticed any change. When I use a thawed-out glaze I just heat a jar full of it to boiling in the microwave then poor that into the bucket with the cold glaze to warm it up.

Jim
E pur si muove.

"But it does move," said Galileo under his breath.

#4 missholly

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Posted 23 March 2013 - 09:46 PM

actually, they don't freeze, and they're not commercial glazes. they are glazes I've made with either stains or oxides.
I've had several do this and its aggravating when i have a certain expectation of a glaze and it ends up ruining a good piece.

the first glaze i made actually is a gorgeous brilliant turquoise. i made a good handful of pieces and the glaze was beautiful. as i continued to use it, it started getting
bubbly, or matte. (i know this is usually too much water, but i retested it several times) I've also tried testing it on different levels of my kiln because an 06 firing can give me different temps on different levels.

ugh.


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#5 Brian Reed

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Posted 23 March 2013 - 11:11 PM

In my experience there are so many variables that need to be taken into account. The temperature when they are applied, the time I hold them into the bucket when dipping, the thickness or thinness of the application. They there is the bisque. Is it done exactly the same every time, as in temp, heat, soak, and thick ness of the piece. These effect the porousness of the bisque. Lastly the final firing. I use cone 10 reduction so if I get sloppy or lazy and do not watch it exactly my firing varies.

I would not consider pots ruined, just different.



Good luck and test.
Brian Reed

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