Sharon Miranda on tue 22 apr 97
Here is a recipe for o4 clear (that is, transparent) turquoise
76.3 frit 3110
5.7 Gerstley Borate
7.1 EPK
10 flint
1 CMC
add: 3 Copper carb
This is a very simple reliable and singularly unappealing glaze (for me,
that is) and I've got a whole bucket of the darn stuff.
Could anyone please suggest a way that I could alter this - I'm trying to
get an opaque, soft satin, milky turquois e.
I have tried adding 5% tin ox, or 5% titanium diox, -no real change
Then I tried 10% tin, then 10% tin+5 %titanium - still not much change.
Then I tried 20%zircopax and 20% titanium - somewhat more matt, but not
enough opaque.
In all these tests I used 200 grams of liquid glaze.
I realize I am groping around in the dark - I cook like this, too.....
Would appreciate any help at all.
Sharon
*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*
Sharon LaRocca-Miranda *
92 Morgan Street *
Oberlin, Ohio 44074 *
Sharon.Miranda@oberlin.edu *
. . . . . . . . . . . . . . . .*
* * * * * * * * * * * * * * * * *
c
George Mackie on wed 23 apr 97
Sharon - It looks like a very runny, over-fluxed glaze. If it was me, I
would add more flint and maybe some barium for matness and then try again
with opacifiers. How about this:
Your present glaze 60
Flint 25
Barium carb 5
Zinc oxide 10
If this gives a reasonable looking glaze in terms of texture, fit,fluidity
etc, a fairly small amount of one of the opacifiers you have already tried
might give be enough, e.g. 5% titanium. You would also have to increase
the copper to bring it back to 3%
George
On Tue, 22 Apr 1997, Sharon Miranda wrote:
> ----------------------------Original message----------------------------
> Here is a recipe for o4 clear (that is, transparent) turquoise
> 76.3 frit 3110
> 5.7 Gerstley Borate
> 7.1 EPK
> 10 flint
> 1 CMC
> add: 3 Copper carb
>
> This is a very simple reliable and singularly unappealing glaze (for me,
> that is) and I've got a whole bucket of the darn stuff.
> Could anyone please suggest a way that I could alter this - I'm trying to
> get an opaque, soft satin, milky turquois e.
> I have tried adding 5% tin ox, or 5% titanium diox, -no real change
> Then I tried 10% tin, then 10% tin+5 %titanium - still not much change.
> Then I tried 20%zircopax and 20% titanium - somewhat more matt, but not
> enough opaque.
> In all these tests I used 200 grams of liquid glaze.
> I realize I am groping around in the dark - I cook like this,
too.....
> Would appreciate any help at all.
> Sharon
> *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*
> Sharon LaRocca-Miranda *
> 92 Morgan Street *
> Oberlin, Ohio 44074 *
> Sharon.Miranda@oberlin.edu *
> . . . . . . . . . . . . . . . .*
> * * * * * * * * * * * * * * * * *
> c
>
George Mackie on fri 25 apr 97
Sharon - substituting strontium for barium is probably ok but you would
need a bit less of it- about three-quarters of the amount, i.e. 3.5 parts.
The idea is to replace one atom of barium with one of strontium and this
works out at .75 parts by weight of strontium carbonate for 1 part of
barium carbonate. To tell the truth, Im not optimistic about saving your
glaze as its difficult to get a really nice silky matt semi-opaque
turquoise glaze at cone 04, or so I have found. They tend to be bland,
uninteresting, and lacking in depth, or too thin and punetsy, so that
differences in thickness are very obvious, or the clay body colour shows
through, or both, or all three. Still one learns by experiment, and you
might get lucky. At least, theres nothing to lose if the present glaze is
so repellent to you!
I am copying this to the clayart list as other potters may be able to
recommend some good ones.
George
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