Judy Rohrbaugh on fri 17 feb 06
Thank you Don and Steve for the info.
Don, the color of blue on your pots is what I have gotten before, only in smaller amounts floating on top of a nice reddish plum brown. I was trying to get more blue and less brown by putting it on top of the white clay. I did get more blue, but it was a duller color.
I am taking the advice of not adding more cobalt, that makes sense.
Next time I fire this I will go back and put it on the buff body, to see if I can get the plum brown/ blue color again.
And I will add more rutile when I try again on the white body. I use this base recipe with no colorants all of the time as a clear on another clay and I do trust it. It is quite stable in this form.
The refiring is interesting because that's how I stumbled on this some time ago. If the pots don't get fired hot enough it is a dull brown, refired a bit higher and I get the blues.
But I never put more than one row of pots in the kiln with this glaze, always on the bottom shelf. It is never predictable so I don't want to ever fire too many at once.
Most of the time I am fairly satisfied with what I end up with, but it is never the same thing twice.
My recipe is similar to what you posted, no neph sy, and this last batch I used 1/2 real gerstley borate and 1/2 a substitute. Last batch was all substitute, that could have changed things too, I guess.
Judy Rohrbaugh
Fine Art Stoneware
Ohio
Steve Slatin on sat 18 feb 06
Chris --
Yes, see Digital Fire website at
http://ceramic-materials.com/cermat/material/2387.html
for details and pictures.
Regards -- Steve Slatin
Chris Schafale wrote:
So, Steve talked about a rutile blue that has no cobalt. I'm familiar with
the classic cone 10 rutile blues, but is there such a thing in the cone 6
ox. universe?
Chris
Steve Slatin --
In watermelon sugar the deeds were done and done again
as my life is done in watermelon sugar.
---------------------------------
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William & Susan Schran User on sat 18 feb 06
On 2/17/06 10:49 PM, "Judy Rohrbaugh" wrote:
> But I never put more than one row of pots in the kiln with this glaze, always
> on the bottom shelf. It is never predictable so I don't want to ever fire too
> many at once.
Judy - Do you place witness cones on your bottom shelf? Just wondering if
your getting better results with the floating blue because the bottom is
firing slightly cooler. Might be a good test on your next firing.
-- William "Bill" Schran
Fredericksburg, Virginia
wschran@cox.net
wschran@nvcc.edu
Judy Rohrbaugh on sat 18 feb 06
Yes, Bill, I have cones on the shelf.
My bottom shelf always gets hottest, unless I work the switches to keep it even.
I have an electic kiln with coils on the floor. About one inch up is my first shelf.
I have had my glaze go greenish also, not lately, I thought it was due to being on too thin.
My regular work is fired best at cone 6, just barely bending. I am using the same base glaze that I use as a floating blue on many of these pots, but without the colorants, just the rutile. When it is just a clear glaze it is very reliable and has a larger range of firing.
But, as soon as the cobalt and iron go into it, it's finicky and unpredictable.
I looked at some of the pictures in the CM article of floating blue. I get some of that on top of brown. I am probably not a "true" floating blue, well, unless I can get this glaze to show more blue.
But otherwise, my glaze seems to fit into a lot of the parameters that all of you discuss.
Judy Rohrbaugh
Fine Art Stoneware
Ohio
Chris Schafale on sat 18 feb 06
So, Steve talked about a rutile blue that has no cobalt. I'm familiar with
the classic cone 10 rutile blues, but is there such a thing in the cone 6
ox. universe?
Chris
Chris Schafale on sun 19 feb 06
Very cool. Thanks.
Chris
At 07:12 PM 02/18/2006, you wrote:
>Chris --
>
> Yes, see Digital Fire website at
>
> http://ceramic-materials.com/cermat/material/2387.html
>
> for details and pictures.
>
>
> Regards -- Steve Slatin
>
>
>Chris Schafale wrote:
> So, Steve talked about a rutile blue that has no cobalt. I'm familiar with
>the classic cone 10 rutile blues, but is there such a thing in the cone 6
>ox. universe?
>
>Chris
>
>Steve Slatin --
>
>In watermelon sugar the deeds were done and done again
>as my life is done in watermelon sugar.
>
>---------------------------------
> Yahoo! Autos. Looking for a sweet ride? Get pricing, reviews, & more on
> new and used cars.
>
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