Glaze Type: Mid-fire
berry rust: 10% red iron oxide
deep river red: 20% RIO
midnight blue: 5% cobalt carb., 2% RIO, 1% copper carb.
silver yellow: 6% vanadium oxide, touch of rutile
majolica: 7% tin oxide
By itself without colorants, this glaze is fairly clear, not
perfectly transparent at cone 6-7 but becoming glass like at 8-9.
It is smooth to the touch, pleasing to feel. Very tolerant and
It is somewhat uninteresting by itself although it is as stable as
you can imagine.
Add colorants for the real action!
*How long have you been using this glaze?
*Where is it used? Bob Kavanagh's studio.
*Where did this recipe come from? I developed it over a few years.
*What do you like most about this glaze? It is stable, adaptable, accepts diverse
colors well, applies easily, is virtually fault free - a good friend.
*Does this glaze tend to craze/crawl/pinhole/etc.?
With the majolica, it may crawl if the glaze is applied VERY thickly.
*How do different firing temperatures/atmospheres affect the glaze?
It may be used in reduction as well as in oxidation, although I now
use it only in oxidation. I developed it while I was working in a
reducing atmosphere. The differences between oxidation and reduction
lie in the clarity of the glaze (much clearer in oxidation) and of
course the impact of reduction on iron bearing oxides.
*How does the glaze behave on different clay bodies?
Very adaptable to stoneware, porcelain, rough, smooth, etc.
*What consistency should the glaze be for pouring/dipping?
Dip hand into bucket; can hardly see skin under glaze on hand: thick
*How thickly should the glaze be applied to the pot?
Varies with oxide addition. Likes to be moderately thick for
*How does this glaze interact with other glazes?
I had not been happy with combining it with others, so I stopped. It
can be layered with itself with different colorants in each layer.
*What is your kiln type and size?
10 cubic foot, Tucker's Cone Art, electric
*How do you typically fire?
0 to 212 in two hours: hold 10 minutes.
212 to 1040 at about 300 degrees an hour.
very slowly from 1040 to 1070.
as quickly as possible from 1070 to 2100.
about 150 degrees an hour until cone 7-8.
*Do you experience problems with the raw glaze?
Submitted by: bob kavanagh
|Nepheline Syenite (Theoretical)||18.2|