"Rafael Molina-Rodriguez (Rafael Molina-Rodriguez)" on sat 30 nov 96
Clayarters :
I'm intrigued by the "saffron yellow" glaze Brother Thomas achieves with
his work. I have the book and video both titled "Gifts from the Fire : The
Porcelains of Brother Thomas". In the book and video there are splendid
examples of a high fire iron yellow. Brother Thomas claims it is an iron
saturated glaze that turns yellow instead of a dark brown Tessah or
Tenmoku. Does anyone on the list have an idea how this works or a
glaze recipe? I have numerous iron saturated glaze recipes but none of
them turn yellow. I've read that refiring them at a lower temperature in an
oxidizing atmosphere may change the color response (Greg Daly's
"Glazes and Glazing Techniques"). I'm going to try this.
Another example of yellow porcelains are Cliff Lee's Imperial Porcelain
series. They are featured in an advertisement in one of the recent
"American Craft" issues. I'm not sure if it's a high-fire glaze or low-fire
enamel overglaze. Anyone on the list have information on Mr. Lee's
recent work? TIA.
Rafael
rmr3431@dcccd.edu
Craig Martell on sat 30 nov 96
Hi Rafael: I don't know anything about Brother Thomas and Cliff Lee's
glazes, but I do have an iron yellow glaze that I got from Dave Shaner in
1980. It has some scary oxides in it so you might want to do a unity formula
to see how things stack up against the silica. It's a nice yellow on
porcelain, I haven't seen it on stoneware so I have nothing to report on that
subject.
KT Yellow Cone 10Red.
Nepheline Syenite 20.0%
Whiting 15.0
Barium Carb. 25.0
Lithium Carb. 3.0
Ball Clay 25.0
Flint 10.0
Iron 2.0
Dave didn't specify the type of iron used in the glaze.
Buena Suerte, Craig Martell-Oregon
TYLERCD@gov.ns.ca on mon 2 dec 96
I curated a show of Brother Thomas' work which included a yellow pot.
While he is a truly gentle and delightful man, I couldn't get much
information out of him of a technical nature at all! I did find that his
requirements are so specialised that he ran into trouble when he moved
from Vermont to Pennsylvania because of the trace elements in the
water supplies being different. He also sometimes uses unusual
elements, such as nickel. His firing proceedures are complex.
Unless someone has a source of his technical information which I don't
know about (quite possible) I suggest you follow the Chinese examples
which might have been Thomas' starting point in the first place.
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