Chris Campbell on sun 2 aug 98
When I read posts about converting glazes up and down temperature wise there
is one issue I don't understand.
The color, texture, depth and beauty that you love in the original glaze is
the result of a certain amount of heat being applied to ALL the ingredients
not just the flux. I don't see how it is possible to achieve satisfactory
results at lower or higher temperatures than was used in the original.
Don't temperature shifts affect every ingredient??
Isn't asking for a glaze to perform the same way at different temperatures
like asking an electric kiln to fire like gas??
Chris - in Carolina - not outside mixing glazes in this heat !!!!
hal mc whinnie on mon 3 aug 98
the basic component is the feldspar and if you select a feldspar with
lower amounts of silica within it you lower the temperature. you do not
mess with the other materials. custer feldspar for e=example has 7
molecules of silica for easier molecule of the materials and hence if you
substitute neph syn which has only 4 molecules of silica you lower the
temperatures.
On Sun, 2 Aug 1998 11:20:10 EDT Chris Campbell
writes:
>----------------------------Original
>message----------------------------
>When I read posts about converting glazes up and down temperature wise
>there
>is one issue I don't understand.
>
>The color, texture, depth and beauty that you love in the original
>glaze is
>the result of a certain amount of heat being applied to ALL the
>ingredients
>not just the flux. I don't see how it is possible to achieve
>satisfactory
>results at lower or higher temperatures than was used in the original.
>
>Don't temperature shifts affect every ingredient??
>
> Isn't asking for a glaze to perform the same way at different
>temperatures
>like asking an electric kiln to fire like gas??
>
>Chris - in Carolina - not outside mixing glazes in this heat !!!!
>
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Edouard Bastarache on mon 3 aug 98
Hello Chris,
the following C/8-10R glaze was brought down to C/04
in a few steps i outlined in my last message on the
subject plus taking china clay out.
Custer spar.......56.8
Dolomite...........13.6
Whiting.............10.6
Zinc oxide(calc.).3.0
E.P.K................16
100
Rutile.................4
This is a light to medium tan when there is a lot of reduction, and used
over a dark burning clay
Here is what it gives:
Nepheline/Syenite............53
Dolomite........................13
Whiting..........................9.5
Zinc oxide(calc.).............2.5
Gerstley borate..............15
Fritt #3134.....................7
100
Rutile............................10.5
We had equal amounts of boron bearing materials at C/4 but decided to
continue
fluxing with Gerstley borate till C/04.
We also had to increase the amount of Rutile as compared to the original
glaze
because of the atmosphere factor in order to obtain a color close to the
original.
Later,
Edouard Bastarache
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
----------
> De : Chris Campbell
> A : CLAYART@LSV.UKY.EDU
> Objet : Glaze conversion question-maybe dumb??
> Date : 2 ao{t, 1998 11:20
>
> ----------------------------Original message----------------------------
> When I read posts about converting glazes up and down temperature wise
there
> is one issue I don't understand.
>
> The color, texture, depth and beauty that you love in the original glaze
is
> the result of a certain amount of heat being applied to ALL the
ingredients
> not just the flux. I don't see how it is possible to achieve satisfactory
> results at lower or higher temperatures than was used in the original.
>
> Don't temperature shifts affect every ingredient??
>
> Isn't asking for a glaze to perform the same way at different
temperatures
> like asking an electric kiln to fire like gas??
>
> Chris - in Carolina - not outside mixing glazes in this heat !!!!
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