timhanrahan
New Member
Still growing crystals!
Posts: 22
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Post by timhanrahan on Jun 1, 2018 20:44:19 GMT -6
Hello Folks, Im back in my studio for the summer and had nice firing, but had a puzzling result on one of my pots. I thought I'd throw it out there for some thoughts from the experts. Cone 9 glaze, 3110 base. Seven pots fired, 6 with Bmix came out nice, the 7th made with Dave's porcelain had great crystals, but the surface appears "textured". I will attempt to post pictures, first the close up of the porcelain pot, then a Bmix pot with the same glaze which has a glass surface. Normally my porcelain pots come out smooth, so I am puzzled. Does porcelain fire hotter than Bmix? Your thoughts are most appreciated. I was trying to replicate the the glaze in my profile picture. linktextured surface link2 bmix same glaze |
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Post by mariewright on Jun 2, 2018 16:27:14 GMT -6
Hi Tim,
I have had that textured look happen before with a 3110 glaze with nickel. I was also using porcelain. I believe the texture you see is loads of secondaries. For me, the problem was solved by doing more heat work. I held at the hottest temp for a longer time. I also sometimes use b-mix, and it always looks different from porcelain. In my opinion, porcelain looks better 95% of the time, but I have one glaze that I prefer on porcelain.
Good luck,
Marie
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gczop
Full Member
Posts: 202
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Post by gczop on Jun 3, 2018 9:58:13 GMT -6
Hi Tim, This was posted in the previous forum with the question of what the secondaries might be. Nickel and high % manganese involved,413 base. G  |
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Post by mohawkpiper on Jun 4, 2018 19:40:27 GMT -6
i would say those are definitely secondaries from the nickel. nickel is fickle and different clay can make big changes with these glazes. i have gone two routes in “fixing” this. one is lessening the nickel and adding iron and/or manganese to compensate for the color loss of less nickel. the other is try different “base” glazes. good luck!
alternatively you can try playing with glaze fluidity or thickness on the porcelain one.
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Post by mohawkpiper on Jun 4, 2018 19:45:26 GMT -6
oh sorry Marie i totally didnt see your post! Yea do what Marie says she is amazing at this stuff!
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Post by mohawkpiper on Jun 4, 2018 22:25:01 GMT -6
Tim, if you want... i have examples of your bmix one looking pretty much exactly the same... and examples of what i did to fix it. If you don't mind waiting til the weekend i can dig that up and give you the recipes from and to so you can see the difference. i never liked changing my peak temp or melt.. so they went through similar schedules. they are both on bmix and they are both with 3110. eventually i switched my nickel glazes to a 3110/413 hybrid.. i think... possibly full 413... not sure... but there is a version that worked in there somewhere with just 3110.
Best,
G
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Post by mohawkpiper on Jun 4, 2018 22:28:09 GMT -6
oh i got it backwards... bmix and porcelain... for you...
anyhow... i can still dig that up regardless and show you what i changed.
G
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Post by adammacmillan on Jun 5, 2018 21:51:34 GMT -6
What’s your formula? This also looks like maybe your nickel concentration is too high and maybe some titanium is present? You could try using 0% TiO2 and 1% nickel
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Post by mohawkpiper on Jun 11, 2018 22:33:21 GMT -6
crud i totally forgot about this. ill try again this upcoming weekend
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