hal mc whinnie on wed 30 aug 00
MARY'S FLOATING BLUE
CONE 8-10 REDUCTION
bone ash 4
silica 25
gertsley borate 7
magnesium carb 3
neph syn 40
light rutile 3
whiting 10
zinc oxide 5
illmanite 2
cobalt carb 0.5
The quintessential balanced glaze type, it encourages reliable, durable
non-flowing glazes with appealing surfaces. This group was developed at the
University of Maryland inthe mid 1970's.. I guess by this time it is in the
category of historical glazes.
note:
I have followed the debates about floating blue and I wish to differ from
Kaplan, it is a glaze which is well worth some research.
note 2
In my last glaze some questioned the fact that the amounts did not add up to
100%. When glazes are developed from a seger formula the amount does not add
up to 100 unless one converts to a percent.
Ron Roy on fri 1 sep 00
This is probably not a durable glaze at cone 8 and it looks even more
dubious at cone 10 - it's short of both alumina and silica in both cases.
If it's fired in reduction and the zinc is reduced out - as it is in many
cases - then the glaze is probably durable at cone 8 but still iffy at cone
10.
Anyone willing to do a test at either temperature? Just fire it with the
zinc in and out to see if the melt is the same with both.
RR
>MARY'S FLOATING BLUE
>CONE 8-10 REDUCTION
>bone ash 4
>silica 25
>gertsley borate 7
>magnesium carb 3
>neph syn 40
>light rutile 3
>whiting 10
>zinc oxide 5
>illmanite 2
>cobalt carb 0.5
>
>The quintessential balanced glaze type, it encourages reliable, durable
>non-flowing glazes with appealing surfaces. This group was developed at the
>University of Maryland inthe mid 1970's.. I guess by this time it is in the
>category of historical glazes.
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
hal mc whinnie on fri 1 sep 00
I beg to disazgree, it proved to be a very durable glaze for cone 8-10,
would be interested in others testing it.
also it does well at cone six, runny but very effective.
hal mc whinnie
-----Original Message-----
From: Ron Roy
To: CLAYART@LSV.CERAMICS.ORG
Date: Friday, September 01, 2000 12:10 PM
Subject: Re: GLAZE OF WEEK FOR AUG 31 2000
>This is probably not a durable glaze at cone 8 and it looks even more
>dubious at cone 10 - it's short of both alumina and silica in both cases.
>
>If it's fired in reduction and the zinc is reduced out - as it is in many
>cases - then the glaze is probably durable at cone 8 but still iffy at cone
>10.
>
>Anyone willing to do a test at either temperature? Just fire it with the
>zinc in and out to see if the melt is the same with both.
>
>RR
>
>>MARY'S FLOATING BLUE
>>CONE 8-10 REDUCTION
>>bone ash 4
>>silica 25
>>gertsley borate 7
>>magnesium carb 3
>>neph syn 40
>>light rutile 3
>>whiting 10
>>zinc oxide 5
>>illmanite 2
>>cobalt carb 0.5
>>
>>The quintessential balanced glaze type, it encourages reliable, durable
>>non-flowing glazes with appealing surfaces. This group was developed at
the
>>University of Maryland inthe mid 1970's.. I guess by this time it is in
the
>>category of historical glazes.
>
>Ron Roy
>93 Pegasus Trail
>Scarborough
>Ontario, Canada
>M1G 3N8
>Evenings 416-439-2621
>Fax 416-438-7849
>
>___________________________________________________________________________
___
>Send postings to clayart@lsv.ceramics.org
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>
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melpots@pclink.com.
ginny bivaletz on fri 1 sep 00
--- hal mc whinnie wrote:
> I beg to disazgree, it proved to be a very durable
> glaze for cone 8-10,
> would be interested in others testing it.
>
> also it does well at cone six, runny but very
> effective.
>
i'm confused about how the glaze could be runny at ^6
yet not at ^ 10. my beginners intuition tells me the
opposite.
=====
ginny from orcas island, washington.
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