Alisa and Claus Clausen on thu 20 jul 00
Glaze receipe from Ceramics Monthly, May 2000
=20
Tested on light grey medium range stoneware.
=20
Receipe
Gerstely Borate 30%
Whiting 10
Custer Feldspar 35
P.V. Clay Plastic Vitrox 15
Flint 10
=20
ADD
Red Iron Oxide 2%
Rutile 3%
=20
Substitutions used
Forshammer feldspar for Custer
Cornwall stone for P.V. Clay =20
=20
Descibed as a soft cream below a very glossy shell.
It is just that. A opaque cream under very shiny clear. Interesting =
structure under the gloss.
Nice flat surface, evenly melted.
=20
CREAM GLOSS OVER PLUM
This combination gave a shiny, smooth honey brown gloss, with beautiful =
opalescent breaking over the high=20
areas and where it pooled. It looks exactly like the photos of the work =
in the Ceramics Monthly (May 2000)
with beautiful, fluid changes of color all over the vessel. I mixed my =
batch a little thick to test for dripping and=20
even with two layers of reasonably thick glazes, it pooled to a bright =
opalescence, but did not drip off the foots=20
of the pots. I am really impressed with this combination as it is the =
type of surface I personally like very much for
decorative vessels. =20
=20
Glaze Gurus, any chance of recalculating these without the Gerstley =
Borate?
Ron Roy on sun 23 jul 00
Hi Alisa,
It is difficult with only frit 3134 - can't get the B2O3 up as high but it
may work - if you can get CadyCal then it becomes easy - see #2.
Wolff's Cream gloss c6 revised by RR
-----------------
F3134............... 45.5
TALC................ 4.5
CUSTER SPAR......... 19.00
CORNWALL STN......... 6.00
EPK................. 14.50
SILICA.............. 10.50
----------
Total 100.00
FORMULA & ANALYSIS
------------------
*CaO........ .54 9.97%
*MgO........ .11 1.40%
*K2O........ .07 2.25%
*Na2O....... .28 5.64%
Fe2O3...... .00 .16%
TIO2....... .00 .05%
B2O3....... .47 10.78% (original has 0.54 B2O3)
AL2O3...... .30 9.92%
SiO2....... 3.10 59.77%
RATIO 10.25 (original is 10.18)
EXPAN 467.32 (original is 483.86)
WEIGHT 305.39 (original is (316.96)
Wollf's Cream gloss c6 revised by RR with CadyCal
-----------------
F3134............... 22.50
Cady frm mine (MDT). 14.00
TALC................ 5.00
CUSTER SPAR......... 41.00
CORN STN............ 12.00
SILICA.............. 5.50
BENTONITE........... 2.00 (note - no raw clay so this will help suspend)
----------
Total 102.00
FORMULA & ANALYSIS
------------------
*CaO........ .51 ..... 9.19%
*MgO........ .13 .....1.63%
*K2O........ .16 ..... 4.70%
*Na2O....... .21 .... 4.18%
Fe2O3...... .00 ..... .26%
TIO2....... .00 ....... .01%
B2O3....... .54 .....12.04%
AL2O3...... .29..... 9.61%
SiO2....... 3.02 .... 58.31%
RATIO 10.32
EXPAN 481.70
WEIGHT 310.96
Let us know how they work please.
RR
>Tested on light grey medium range stoneware.
>
>Receipe
>Gerstely Borate 30%
>Whiting 10
>Custer Feldspar 35
>P.V. Clay Plastic Vitrox 15
>Flint 10
>
>ADD
>Red Iron Oxide 2%
>Rutile 3%
>
>Substitutions used
>Forshammer feldspar for Custer
>Cornwall stone for P.V. Clay
>
>Descibed as a soft cream below a very glossy shell.
>It is just that. A opaque cream under very shiny clear. Interesting
>structure under the gloss.
>Nice flat surface, evenly melted.
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
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