david moynihan on mon 20 feb 06
There was a question about the rutile blues at cone 6.
Sorry I don't have the quote.
I am firing semimate base one and two from MC6 really fast and cooling the same. They are high gloss for me this way.
What I have found is a "floating blue" as the glaze gets heavier.
The blue seems to be most vivid when the rutile gets around 4% and the stains I'm adding are at the same.
I can't help but think it's the rutile as I get the same blue in multiple glazes.
I am still playing with them to see. In the mean time...
Does anyone else get "floating blue" in these glazes?
And if not.......Does it have to do with the ramp speed?
Meaning am I "catching and holding" the blue in the cooling cylcle.
still playing,
david
Judy Rohrbaugh on tue 21 feb 06
David, that was probably my post that you read, as I am experimenting with a glaze, too. My glaze is a mix of blue and brown, I am trying to get more blue and less brown, although I like it the other way, too.
I do have another glaze that I have used which has some rutile. I am currently using it as a green, but it was originally a blue. I have one old pot here with this blue on it, it was fired to cone 9, but I currently fire it at 6. This pot was fired in a crusader kiln way back, which means it cooled pretty quickly.
I looked at the pot, I guess you could say the blue is floating.
Cobalt with and without rutile is quite different.
The recipe that I am currently using for my "floating blue" was originally lavender, I found it in a book.
The lavender color is gotten by using 1% cobalt, and no rutile, which I changed.
Best wishes with experimenting.
Judy Rohrbaugh
Fine Art Stoneware
Ohio
david moynihan wrote:
There was a question about the rutile blues at cone 6.
Sorry I don't have the quote.
Chris Schafale on tue 21 feb 06
David,
What stains are you adding?
Chris
At 11:04 PM 02/20/2006, you wrote:
> There was a question about the rutile blues at cone 6.
> Sorry I don't have the quote.
> I am firing semimate base one and two from MC6 really fast
> and cooling the same. They are high gloss for me this way.
> What I have found is a "floating blue" as the glaze gets heavier.
> The blue seems to be most vivid when the rutile gets around 4% and
> the stains I'm adding are at the same.
> I can't help but think it's the rutile as I get the same blue in
> multiple glazes.
>
Ron Roy on wed 22 feb 06
Hi David,
Rutile and/or titanium with boron makes a milky blue in some glazes - -
probably the rutile is better because the iron helps. - I'm trying to
remember - does it need to be high in CaO?
I maybe able to distill something from the molecular formulas that will
point in the right direction - another advantage of using the molecular
formula approach - really cuts down the time and number of tests you have
to do to get at the solution.
RR
> There was a question about the rutile blues at cone 6.
> Sorry I don't have the quote.
> I am firing semimate base one and two from MC6 really fast and
>cooling the same. They are high gloss for me this way.
> What I have found is a "floating blue" as the glaze gets heavier.
> The blue seems to be most vivid when the rutile gets around 4% and the
>stains I'm adding are at the same.
> I can't help but think it's the rutile as I get the same blue in
>multiple glazes.
> I am still playing with them to see. In the mean time...
> Does anyone else get "floating blue" in these glazes?
> And if not.......Does it have to do with the ramp speed?
> Meaning am I "catching and holding" the blue in the cooling cylcle.
> still playing,
> david
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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