Lynne Berman on thu 29 nov 01
Winston,
Here's my collection of recipes. I think the Gordon Hutchens' one is what you
are after but each provides different patterns and different challenges. My
recommendations, wet the bisqued piece, apply the slip quite thick, let it
dry for several days, then try to get it in and out of the kiln without the
slip falling off.
Good luck,
Lynne Berman in downtown Philadelphia
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
____________________________________________________
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
__________________________________________________
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
___________________________________________________________
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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