Nancy Weckwerth on wed 17 nov 99
I'm looking for a glaze recipe for a teal blue/green crackle glaze for
porcelain. Cone 5. I wouldn't call it a celadon green. It has more blue
in it.
I've seen this type of glaze on Japanese pieces. It's usually
transparent and has a high gloss. I'm just
learning to create my own glazes so I'm not particularily interested in
a commercial product.
However, if anyone knows of such a product, I'll take the info.
Thanks,
Nancy
Paul Lewing on thu 18 nov 99
Nancy Weckwerth wrote:
>
> ----------------------------Original message----------------------------
> I'm looking for a glaze recipe for a teal blue/green crackle glaze for
> porcelain. Cone 5. I wouldn't call it a celadon green. It has more blue
Hi, Nancy.
You can easily make this yourself, and start with any number of glaze
recipes that are out there in books or in the archives, but here are
some guidelines.
First, the crackle. This is caused by too high a rate of thermal
expasion. It's pretty easy to find a cone 5 crackle glaze- in fact,
it's hard to find a clear cone 5 glaze that DOESN'T crackle. To make
any glaze craze, the easiest thing to do is leave out some of the
silica. So find a clear glaze recipe, make a test of it with half the
silica the recipe calls for, then add it back in 5% increments till you
have the amount called for in the recipe. It's virtually certain that
one of the steps in that series will be the way you want it.
Second, the color. Cobalt makes blue, and (in oxidation) either chrome
or copper make green. I assume you're firing electric. If you're
reducing, you need to use the chrome rather than the copper. Copper
will make you a clearer, more interesting green than chrome. And a
glaze base that has a lot of zinc oxide in it (say, more than 8%) will
make a bluer green with copper than other base glazes. So I'd start by
testing increments of cobalt (probably the carbonate) starting with 1/2%
and going up 1/2% at a time to about 3%, and I'd test increments of
copper (again, probably carbonate) of 1% up to about 6%. This is
bacause cobalt is a more powerful colorant than copper. You can make
these color tests in the base glaze test batches. Fire those and see
how blue and how green they turn out, then make another series of tests
of the two together in the same batch at about the concentrations you
liked in the individual colorant series.
You should easily have a teal crackle glaze of your own devising in no
more than four firings.
Welcome to glaze testing and good luck.
Paul Lewing, Seattle
SusanRaku@AOL.COM on sun 7 mar 04
I cannot find my old recipe for a honey transparent at cone 6 oxidation. All
I remember is that it contained Albany Slip.
Does anyone have such a recipe or another one that will get similar results?
Thanks.
Susan
Pamela Watkins on sun 7 mar 04
Hi Susan,
I use a ^6 clear with 3% Rio for the honey transparent. Works like a charm.........
Happy Fires,
Peace,
Pamela
~jaq
Raku@AOL.COM wrote:
I cannot find my old recipe for a honey transparent at cone 6 oxidation. All
I remember is that it contained Albany Slip.
Does anyone have such a recipe or another one that will get similar results?
Thanks.
Susan
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SusanRaku@AOL.COM on sun 7 mar 04
Pamela, would you mind sharing your clear recipe with me? I am not sure that
just any recipe would work.
Thanks.
Susan
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