Randy McCall on wed 21 dec 05
I have been experimenting with Floating Blue from Chappell and I always get
a nice opaque blue if I sub cobalt carbonate 1 %. I am also getting a nice
semi transparent black with some teadust by using 1.5 cobalt carbonate 4%
iron and 2% rutile. I brush on two medium layers. I seem to get more
teadust where it is thinner. I tried to spray some rutile on but it only
turned the glaze more brown. My next test is a blue green with 4% copper
carb, 1/2% cobalt carb, 2% iron, 4% rutile.
I usually just pour one or two coats based on the thickness of the glaze on
the inside of vessels. It usually does better if you pour it own. It has a
tendency to show brush strokes if you do not get it on thick enough. I am
experimenting with sponging on the last layer to see if that will remove the
brush strokes.
I like this glaze because it does well from cone 5 through 7 and is nice and
smooth even if you under fire or overfire some.
I have been trying to find a glaze that is not so sensitive to its firing
range and matures to a smooth glaze over a range of at least three cones.
Any good ones out there let me know.
Randy
Pottery Web Site
members.tripod.com/~McCallJ/index.html
South Carolina
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