Judy Musicant on fri 16 aug 02
Ann,
A friend of mine tested Randy's with a few mason stains and, I believe, a few other oxides. Some were quite nice, although the color was rather flat - nothing like the great variation you get with RIO. But the glaze is delightful as far as feel and very stable - doesn't run even when on thick and fired hot, in my experience. Worth testing with other oxides. I bet it'd make a lovely white liner glaze.
Judy
Ann Brink wrote:
"Next firing I will try it with other
oxides. Have any of you used this as a base glaze for cone 6? Ahhhh, so
many glazes, and I really don't want to have a whole lot....too many
options!"
Paul Lewing on fri 16 aug 02
on 8/16/02 12:56 PM, Judy Musicant at huju01@COMCAST.NET wrote:
> Worth testing with other oxides. I bet it'd make a lovely white liner glaze.
Actually, Judy, I'd bet it wouldn't. These iron red recipes tend to be VERY
low in alumina. I have seen some analyses that, because of the particular
analysis of Gerstley Borate that that particular calculation database was
using, had a SiO2:Al2O3 ratio that was infinite. In their analysis, the
glaze had no Al2O3 whatsoever! Most software databases won't quite tell you
that, but all of these iron red recipes I've ever seen have very low alumina
levels and a ratio of 18:1 or more. Consequently, I wouldn't think they'd
be very durable for use as liner glazes. There are certainly far better
ones out there.
Paul Lewing, Seattle
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