sdt on mon 7 oct 96
Hi, my name is Steve. I am looking for a blue crackle raku glaze. I have
seen pieces with this glaze in galleries and they are absolutely beautiful.
Does anyone know of a recipe. I have white crackle. If I had cobalt carb to
it, would I get the blue with crackle?
Thanks..
Steve
Dannon Rhudy on mon 7 oct 96
>----------------------------Original message----------------------------
>
>Does anyone know of a recipe. I have white crackle. If I had cobalt carb to
>it, would I get the blue with crackle?
>
Steve,
It depends what blue you want. You might test with small additions of cobalt
to your white. If you want a turquoise blue, that is done with copper
carbonate,
which I have also seen work with a white crackle base. If you use copper,
try it
with 1% -2% (so it doesn't get too metallic on you), add 1% tin for some
good in-kiln reduction red flashing. Really watch the speed with which you
get into reduction after fire. Too slow, an ugly washed out pale turquoise.
Over white
clay, more blue; over pinkish bisque, some green cast. Size of crackle
dependent
upon thickness of glaze and/or curvature of piece (and of course your glaze
recipe).
Dannon Rhudy
marilyn fenton on tue 8 oct 96
Steve
You might be seeing a clear crackle glaze over a blue
slip.
ZALT@aol.com on tue 8 oct 96
Steve, Steve, Steve.
There are hundreds of shades of blue. There are as many blues at all cone
levels. There are thousands of variations of clay material that will give
you blue. The blues you can get will also change with the atmosphere of your
kiln and the clay body used to make the piece. There will be blues that are
shiny, matt, textured, glossy, wet and dry. There will be blues that look
like the sea, the sky, the flowing waters of the Niagara and the deep voids
of space. There will be blues that match the saphires , the diamonds and the
turquois. There will be blues that match, the eyes of the young lady that
many of us will marry, and match again the blue paint of a little boys room.
Blue is there such a colour? Finally, the time spent, searching for the
blue you want, will give you the real blues. But!!! don't give up.
Read, Read, Read.
Terry
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