Making a Blue Bottle
we continue our blue bottle project with the addition of a beautifully
mottled blue glaze of my own making. This particular glaze is formulated
for US ingredients, so if you substitute with other local ingredients,
you should do some firings on test tiles first.
The Brilliant Ink Blue Glaze
|SGP Ball Clay
How to Glaze
Bisque your slip cast bottles to about 010 (1652o F,
900o C). This will still leave them soft enough to sandpaper
out any unevenness that may surface if your mold was not perfect.
Pour some glaze into the bottle and pour out again, back into your
bucket. If you have made enough glaze (probably unlikely), you can
then dip the whole bottle with the opening facing down into the
glaze. Wipe the bottom with a sponge. Alternatively, pour glaze
over the bottle using a cup or other vessel, until it is covered
in the way you want. Glaze to a medium thickness. If applied too
thinly, the glaze will become transparent. You may want to to wax
or shellac the bottom to make wiping off the excess easier. (The
bottle will stick to the kiln shelf if you don't...). Fire these
bottles in any kiln, in oxidation or reduction, to cone 4. Another
option could be to glaze the interior with a clear glaze, especially
if you were thinking of using these bottles for foods or liquids,
as leaching of cobalt cannot be discounted in this particular glaze,
although I believe it would be unlikely. Get a clear glaze on the
midfire glaze page (but be sure
to test for glaze fit first).
Copper Red Glaze Alternative
|Red Iron Oxide
Fire this glaze in a gas kiln in a strong reduction atmosphere
to cone 4 and cool in reduction to cone 1.
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