hal mc whinnie on thu 7 sep 00
I have long been interested in the 40-30-20-10 system of glaze development
for the following reasons:
1] they are simple, reliable, and have a long ceramic history in the work of
binns
baggs
leach
Rhodes
2] they require few chemicals and some very basic and safe materials
3] they are easy to make and to attain as well as alter.
LEACH WHITE
cone 9-10
reduction
Custer spar 40
silica 30
whiting 20
Epk 10
for color add
bentonite 2
zircopax 10
empirical formula
knao .25 al2o3 .41 sio2 3.95
cao .75
aluminia/silica ratio 1/10
perfect for high fire gloss glaze
HAL'S WHITE
cone 04
neph syn 40
whiting 30
epk 20
silica 10
empirical formula
knao .25 al2o3 .24 sio2 1.78
hal's white
cone 5-6
neph syn 40
whiting 30
epk 10
silica 20
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