Steve Slatin on fri 22 sep 06
Scott --
There're a wealth of recipes available in both ^10 and ^6. Usually
the best thing to do is to find a recipe in the range you're firing
rather than trying to convert.
Because traditionally there were more ^10 recipes than ^6,
the conversion processes usually go in the 10 to 6 direction
rather than the other way. Two of the quick fixes to go 10 to
6 were (1) replace regular feldspar with nepheline syenite
(2) add 10 - 15% gerstley borate. A first try, if for some
reason you want to do this instead of finding a good recipe
already in the ^10 range, would be to try the inverse function
... in this case, taking out the gillespie borate (which is a
near-replacement for gerstley borate).
A more accurate way to re-envision a glaze, is to look at
it in terms of adjusting the percentage of Silica and Alumina
in the recipe -- you can do this by hand, but it's a pain, I
recommend glaze software.
Most ^6 recipes have Silica in the range maybe 62% to 68% of
the total recipe. They have Alumina in the range of maybe
5 to 8 percent. These percentages will change if you have
boron in the recipe, and to some extent will change depending on
the metals used as melters, but it sort of shows you the range.
OTOH, ^10 recipes have 70 - 78% silica and 6 - 8% alumina.
Of course you can look at it the other way -- it takes a smaller
concentration of fluxes to manage a good melt at ^10 than
at ^6.
If I have not confused you utterly at this point let me know
and I'll try again ...
-- Steve S
Scott Hunnicutt wrote:
hey all,
I have a dark green glaze that is formulated for cone 6. I want to
reformulate the cone 6 for use in a cone 10 reduction fire. Anyone know
how to do this? What parts of the glaze to I need to change to make to go
to cone 10?
here the cone 6 formula:
Deep Shiny green c/6
custer feldspar 39.3
epk 8.9
gillespe borate 17.8
strontium carbonate 4.5
flint 22.3
lithum carbonate 3.6
add
copper carbonate 7.0
cobalt oxide .8
thanks for any replies,
scott hunnicutt
Steve Slatin --
The angel lay in a little thicket. It had no need of love; there was nothing anywhere in the world could startle it ...
---------------------------------
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Scott Hunnicutt on fri 22 sep 06
hey all,
I have a dark green glaze that is formulated for cone 6. I want to
reformulate the cone 6 for use in a cone 10 reduction fire. Anyone know
how to do this? What parts of the glaze to I need to change to make to go
to cone 10?
here the cone 6 formula:
Deep Shiny green c/6
custer feldspar 39.3
epk 8.9
gillespe borate 17.8
strontium carbonate 4.5
flint 22.3
lithum carbonate 3.6
add
copper carbonate 7.0
cobalt oxide .8
thanks for any replies,
scott hunnicutt
David Hewitt on sun 24 sep 06
Scott,
Am I correct in thinking that you want the new glaze recipe, fired at
cone 10 and reduced, to look exactly like the cone 6 glaze that you have
at present?
If so, may I ask why you should even want to do such a thing. Just
curious as it costs more and any reduction can significantly alter the
colour.
If you do not reduce, but want a cone 10 glaze, then why not pick any
cone 10 shiny glaze and play around with the colouring oxides you are
already using.
David
In message , Scott Hunnicutt writes
>hey all,
>
>I have a dark green glaze that is formulated for cone 6. I want to
>reformulate the cone 6 for use in a cone 10 reduction fire. Anyone know
>how to do this? What parts of the glaze to I need to change to make to go
>to cone 10?
>here the cone 6 formula:
>
>Deep Shiny green c/6
>
>custer feldspar 39.3
>epk 8.9
>gillespe borate 17.8
>strontium carbonate 4.5
>flint 22.3
>lithum carbonate 3.6
>add
>copper carbonate 7.0
>cobalt oxide .8
>
>thanks for any replies,
>scott hunnicutt
--
David Hewitt
Web:- http://www.dhpot.demon.co.uk
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