According to Whinney from the Tech Staff of Ceramics Monthly, the rule of
thumb for conversion from C/10 to C/6 is: replace the feldspar with Neph.
Syen. and add 10% Colemanite (Gerstley Borate). Sometimes you need to adjust but it works pretty well.
Finally: here is a glaze from Val Cushing’s handbook
VC “71”
Custer Spar 40
frit 3124 9
whiting 16
talc 9
epk 10
flint 16
Val’s comments: wonderful surface. Really sensuous smooth satin matt. Kas
a kind of glow like looking at a pearl. All the colors keep this same character, a gorgeous base glaze.
Remsen Slip
Tile 6 Kaolin 50
OM-4 Ball Clay 10
Silica 20
Custer Feldspar 20
tea dust
potash feldspar 23.0
neph sye 23.0
epk 14.0
flint 5.0
whiting 10.0
red iron ox. 5.0
manganese diox. 5.0
cobalt carb. 5.0
rutile 5.0
talc 5.0
from chappel’s book. nice liner glaze. good for overdipping on rims
and such. it’s a satiny, gunmetal black. kind of hard to describe.
i’ve had problems with it crawling so i use it pretty thin.
Golden fake ash (beautfiul)
cone 6- oxidation/reduction
Ceday Heights redart 27.15
dolomite 23.80
barium sulfate 12.20 (I used strontium carb 9.15)
ball clay 20.40
lithium carb 1.71
gerstely borate 9.64
bone ash 5.10
add:
bentonite 1.00
epsom salts (to water) 1.00
Pinnell strontium Matt glaze, cone 6 oxidation( good – needs to be thick
and go
to true ^6)
lithium carb 1.00%
strontium carb 20.00
neph sye 60.00
ball clay 10.00
flint 9.00
white: titanium dioxide 5.00
weathered bronze green: titanium diox. 5.00, copper carb 5.00
periwinkle blue: cobalt carb 0.15, copper carb. 4.00
dark mottled green: copper carb 8.00
cream/tan: rutile 6.00
charcoal: manganese dioxide 2.00, Copper carb 5.00
Mexico point green (Zakin), cone 6 ox. (good)
soda feldspar 34
spodumene 14
kaolin 6
dolomite 14
gerst. bor 12
zirconium opacifier 20
copper carb 2.5
metallic black, cone 6 ox (wonderful!)
spodumene 50
Gerst. bor 25
flint 25
black iron 10
cobalt ox 2
copper carb 4
Klinesville gold, cone 6/ox (this did not work for me)
magnesium carb 4.49
whiting 20.23
wollastonite 5.62
neph. sy 56.18
cedar heights redart 13.48
add: red iron ox 6.74
zircopax 12.36
smokey brown, cone 6/ox (nice glaze)
custer feld 33.3
flint 22.2
epk 11.1
gers.bor 22.2
RIO 6
manganese diox 3
cobalt ox .5 (point 5)
rutile 1
Floating Red, cone 6 ox (nice glaze)
gerst.bor 54.88
talc 14.63
flint 30.49
RIO 21.95
Celadon, cone 6 ox (o.k. glaze)
gerst. bor 21
wollastonite 8
neph sy 30
kaolin 10
flint 31
celadon: cobalt carb: 0.125, chrome ox: 0.125
teal blue ” 0.5, ” 0.3
teal green ” 0.5, ” 0.5
TWHS ART & DESIGN 