Kurt Wild on sat 21 sep 02
Ned Ludd wrote me off list about what Im had said about "Mel's any glaze
blue". I thought I'd share what Ned wrote me including my reply to him.
>Greetings, Kurt!
>
>What is "plenty of cobalt?" 1 percent says Mel... half that, says Kurt.
>
>Hmm.... not long ago I'd have agreed with you. Then I came across Tom
>Coleman's Royal Cobalt. How much cobalt carb?
>
>5.15% !!!
>
>A very fine cone ten glaze, too. Sumptuous, classy and jewel-like.
Ned - guess I've learned something! I have no argument with you. I had
never experienced a use of cobalt above even 0.75%.
>Need I mention his Violet Eggshell (a variegated magnesium matt semi matt)
>has 2.4 percent of cobalt oxide? Which is still less than half the Royal.
>
>Trust a master like Tom to get away with it!
You are right.
Ned included a jpeg of Royal Cobalt, applied on Claymaker's MAC porcelain
(cone ten) ...... and an excellent blue it was!!
From my favorite chair - leg elevated, now in a short "walking" cast,
slowly getting better - laptop on my lap - phone at my side 715-425-5715
Kurt
Potter Wagoner on sun 22 sep 02
I have always thought that another key to subduing some of the garish
and brash qualities of cobalt is to combine it with other colorants.
Most of our blue glazes have other colorants combined in also.
"Mastering Cone 6 Glazes"
(My favorite glaze book) uses rutile to produce some tamer shades and
tints.
Ned - guess I've learned something! I have no argument with you. I had
never experienced a use of cobalt above even 0.75%.
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