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cobalt blue ...... 5+percent

updated thu 26 sep 02


John Baymore on wed 25 sep 02

>>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%.<

Never actually seen the above glaze in person........ does it have a
tendency to have little semi-gloss or matt-ish microcrystaline stuff on t=
surface anywhere?

It would be interseting to see a leach test for cobalt off that five
percent plus containing glaze. Anyone ever done it by any chance?



John Baymore
River Bend Pottery
22 Riverbend Way
Wilton, NH 03086 USA

603-654-2752 (s)
800-900-1110 (s)