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cobalt oxide slip on earthen ware


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#1 trina

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Posted 13 June 2013 - 05:48 AM

Hi there,

So I fired six earthenware tiles which had been coated in cobalt oxide slip. Three of the tiles were lower down in the kiln than the other three. Now the lower down ones are very intense lovely blue and the slightly higher ones are slightly less blue. I fired these to 1000C with a soak of half an hour. They are for a house sign, so in effect they now dont match. Is it worth firing them again but reversing the positions to see if that helps. I just love ceramics! arrrgggg..... any suggestions appreciated. T

#2 Biglou13

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Posted 13 June 2013 - 07:21 AM

Glaze and fire as before..... Hopefully have 2 sets.....

Is slightly different, bad?
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#3 Mark C.

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Posted 13 June 2013 - 09:07 AM

In ceramics its always different-thats the beauty. Its not like paint colors the same every time.
Enjoy the differeances and tell your customers about why they happen.
Mark
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#4 trina

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Posted 13 June 2013 - 11:40 AM

Can I live with this? T

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#5 Benzine

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Posted 13 June 2013 - 12:00 PM

Can I live with this? T


I don't know about you, but I could live with that. They look great!
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#6 OffCenter

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Posted 13 June 2013 - 01:16 PM

I like them, too, but see the problem and think they would look better if all were the darker blue. I think it would be well worth the re-fire but since you say the darker blue were on the bottom that may mean they were slightly cooler instead of hotter which may make re-firing a waste of time since you can fire the pale ones hotter but not cooler. Does it look like to you that the pale tiles got hotter? Good luck.

Jim
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#7 trina

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Posted 13 June 2013 - 01:21 PM

Ya, I'm thinking that the lighter ones got hotter, I agree they darker ones look better but if if I could get them all the same... refiring tonite and will see...T

#8 trina

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Posted 15 June 2013 - 06:46 AM

So. That made no difference what so ever. I cut some new tiles this morning and will re do them this week. oh well serious eye rolling going on! T

#9 Mark C.

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Posted 15 June 2013 - 07:45 AM

One of the things I have learned over a long period id is color is SUPER important (that is it all needs to match . You should fire them all together in same spot.
This is especially true in high fire reduction and as you just found out matters at lower temps to some degree.-I still like the work but if you want it all the same then make it all over and fire all together same shelve area.
Mark
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#10 OffCenter

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Posted 15 June 2013 - 07:45 AM

So. That made no difference what so ever. I cut some new tiles this morning and will re do them this week. oh well serious eye rolling going on! T


I was afraid that would happen. You probably have a better chance of making the darker ones lighter than the other way around. Good luck with the new tiles.

Jim
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#11 trina

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Posted 15 June 2013 - 07:58 AM


So. That made no difference what so ever. I cut some new tiles this morning and will re do them this week. oh well serious eye rolling going on! T


I was afraid that would happen. You probably have a better chance of making the darker ones lighter than the other way around. Good luck with the new tiles.

Jim


I was trying to fire higher to turn the darker ones lighter..... did i mention that I am ceramically challenged so i will need luck!!! I have never ever had this happen with my colbalt slip not EVER! :)/> ps I almost wanted to positive rate you on that comment, to see what it takes to get out of a neutral rating.... anyway thanks again T

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#12 trina

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Posted 15 June 2013 - 08:04 AM

One of the things I have learned over a long period id is color is SUPER important (that is it all needs to match . You should fire them all together in same spot.
This is especially true in high fire reduction and as you just found out matters at lower temps to some degree.-I still like the work but if you want it all the same then make it all over and fire all together same shelve area.
Mark



Thanks Mark, they were only about two inches lower than the other ones. I have a feeling that the slip was a bit too wet and that somehow affected things, You know when you try to think about the process and if anything changed, well I vaguely remember like a slight cobalt scum floating on the surface of the pale. Oh well, just one of those things. Thanks for your comment anyway. T




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