Wade Blocker on sat 21 apr 01
Twenty years ago (Ceramics Monthly December l981 p.95) Gerald Rowen
published the following glaze which has been featured on Clayart many
times.
Base glaze cone 6 oxidation
Ferro frit 3134 20%
dolomite 20
spodumene 20
ball clay 20
flint 20
Of particular interest is his recommendation of the following direct
substitutions of other materials for the base glaze ingredients to create a
number of different glazes:
Ferro frit 3134 substitute Ferro 3124 or 5301,Pemco frit 54 or 25
,Hommel frit 259
colemanite,lithium carbonate,barium
carbonate or boric acid
for the dolomite " wollastonite,Cornwall stone,volcanic ash
or talc
for spodumene " Custer feldspar,Kona F 4feldspar or
nepheline syenite
The maturation temperature can also be modified by varying the frit
content:
for cone 4 23-28%
cone 5 20 to 25%
cone 7 0 to 10%
cone 8 0 to 5%
This should keep the glaze testers occupied for a while. Mia in sunny ABQ
clayart
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