Lynne Berman on sat 20 nov 99
NAKED RAKU
Resist Slips and Glazes To Go With Them
David Roberts resist slip
(EPK)Kaolin 3 parts by volume
Flint 2 parts by volume
Copper Oxide 10% (or none)
use with the following glaze
Raku Crackle Glaze
(by David Roberts in Sawdust Firing)
High Alkali Frit 45%
Soft Borax Frit 45%
China Clay 10%
Fire to 1562-1652F.
Glaze Marie-Claire in the Netherlands
90% Borax frit
10% kaolin
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Resist Slip Marie-Claire
2 parts kaolin
3 parts flint or silica
works with
Glaze
Frit 3110 65%
Gerstley Borate 35%
don't use this glaze with the Roberts slip
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Jacobsons' Slip and Glaze
Slip
40% Lincoln 60 fireclay
30% 6-Tile clay
20% Ione 412 Grog
10% Custer feldspar
or this variation used without glaze
Chip n Slip
40% Hawthrone Bone or A-P Fireclay
30% Kaolin
20% Pyrotol (or grog)
10% Custer Feldspar
Glaze
60% Ferro Frit 3110
40% Gerstley Borate
Bisque to Cone 012-010
Fire to cone 014 (1540F.), smoke, water-quench, peel
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Gordon Hutchens Slip
used without glaze
Fire Clay 50
EPK 30
Alumina Hydrate 20 (or 10% for easier removal)
Marci Masterson
(From Sharon in Fort Worth)
#1
Fire Clay 40 grams
#6 Tile 30 grams
Custer 10 grams
Grog (28 mesh) 20 grams
#3
Fire Clay 50 grams
EPK 40 grams
Soda Spar 10 grams
(Add 5 - 15% grog)
#4
Fire Clay 50 grams
EPK 35 grams
Nepheline Syenite 15 grams
(add 5% grog - no more)
#5
Fire Clay 45 grams
EPK 35 grams
Flint 10 grams
Nepheline Syenite 10 grams
(add 5% Grog - no more)
Notes:
(can't find #2)
#1. If fire clay is gritty, don't need grog (or need less grog).
Interesting small
design w/o grog. Marcie uses 10% grog. Apply one thinned coat crubbed.
Removes very
easily.
#3. Similar to #1. Marcie uses 10% grog.
#4. Semi straight edge design. Applies 4 even coats. Thinner and smaller
design.
Removed easily.
#5. Fairly straight edge design (almost geometric). Hard to remove. Apply
like #4.
Used w/o grog is good but small.
Additional notes: Every thing with talc "fused". Try other fluxes; try
other clays.
Almost all recipes will work with 25-50% raku claybody w/grog or sand. Mix
slip to a
consistency where it will just "pour" not "plop" off a spoon.
The following is the glaze recipe which is applied over the slip:
70% Ferro Frit 3110
30% Gerstly Borate
Mix "milk" thin and apply thinly.
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