David Hendley on sat 3 oct 98
At 08:41 AM 10/2/98 EDT, you wrote:
>----------------------------Original message----------------------------
>David,
>What is the cone of this glaze? Do you fire this in an "oxy" or "redux"
>atmosphere?
>
Sorry - Cone 10.
Part of my reason for posting this glaze is that it, altough it's
supposed to be fired in reduction, it works even in kilns with
un-even reduction or areas of oxidation.
In my 20+ years of experience with this glaze, it is ALWAYS
dark blue where thick and orange where thin.
We've heard from several people this week who insist that a
rutile blue glaze is very sensitive to the amount of reduction
it receives. That's not my experience with this glaze, and I've
worked with some pretty un-even kilns (copper red on one
side of a pot, and green on the other side).
If someone would like to test it in an electric kiln I would be
interested to hear if it still came out blue.
We've also been told that rutile blue glazes should include
B2O3 in their formulation. Well, this one doesn't and it's
very reliable.
Others have said that rutile blue glazes tend to be, and should
be, runny. This glaze will not run, even a thick coat fired
to cone 12.
Best wishes,
David Hendley
Maydelle, Texas
>> 51 Rutile Blue, from Big Creek Pottery, Davenport, California, 1973
>>
>> Feldspar (I've used all kinds, they all worked).....357
>> Flint.....436
>> Whiting.....159
>> Kaolin.....137
>> Red Iron Oxide.....50
>> Rutile.....50
>>
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