Ron Collins on sun 21 apr 02
There were a few people interested, so I am posting this to the list:
I sold 3 of my teapots the other day, so people like this glaze =
combination.
What I get with this combination is a highly varigated surface-black to =
navy to med. blue to cream on top where thick. Black line where two =
glazes meet. controllable running, no crawling, breaks white over =
porcelain. I think that you could use a black liner glaze with this =
very attractively. I have only worked with it over porcelain. =20
Layering floating blue over Xavier's revised base glaze.
Floating Blue: revised version from PMI:
neph. sye 2700
frit 3134 1540
flint/silica 455
EPK 305
add:
RIO 100
Cobalt oxide 50
rutile 200
macaloid 110 did not use this
Revised Xavier's Warm Jade Green Base Glaze-John Hesselberth
custer feldspar 22
frit 3134 16
whiting 12
talc 9
EPK 20
silica 21
To 5000 grams of above glaze, I added:
0.3% cobalt carbonate
1 heaping tablespoon of yellow ocher
2 heaping tablespoons of rutile
1 tablespoon, level of copper carbonate
NOTE: basically, what you are wanting from the base glaze is a medium =
blue, so add what is necessary to get what you like. I read that you =
should add rutile and ocher to your blue glazes to soften the color, and =
I think that there is something to that.
Dip whole piece in Xavier's . Make sure you dip the whole piece, =
because where you don't, the floating blue will break brown, and it's =
not attractive with this combination. Where the glaze is thin, such as =
rims, handles, etc, the white color of the clay comes through-very =
attractive.
Dip in floating blue, leaving room to test for running. I usually just =
dip the outsides of my pieces in the floating blue, leaving 1" for =
running, but you need to test to find out how much it runs in your =
situation. Makes a nice black line where the two glazes meet.
I fire to small cone 6 in the kiln sitter, not to a full cone 6-try not =
to go to a large cone 6, because that's too much running. Normal =
cool-down. =20
Melinda Collins, Antigua, Guatemala
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