Old Man River Potters Guild - Surface Decoration Workshop
ORPG: Surface Decoration - Low FireClear Glaze tests Cone
05/04
Deb’s Clear Base Cone 04
Ferro Frit 3195 45 %
Ferro Frit 3134 30
EPK Kaolin 25
100 %
Butter Yellow:
Add: Mason Stain 6464
Zirconium Yellow.. 2 %
This glaze is transparent and shiny. Apply thin in order to ensure the fired glaze will be a transparent clear. It is very responsive to colorants. Use a thicker application with colorants to achieve a rich translucent glaze.
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Hirsh Satin Matt Base
(Cone 04–02)
Gerstley Borate 32 %
Lithium Carbonate 9
Whiting 17
Nepheline Syenite 4
EPK Kaolin 4
Silica (Flint) 35
100 %
Add: Bentonite 2 %
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What is SLIP?
*Slip (noun) is a liquefied suspension of clay particles in
water and used in the
production of ceramic ware.
* Most slips
are made for application in the early leather hard stage
*
A close relative of slip is slurry, which
is generally thinner. Slip is usually the consistency of heavy cream.
*Deflocculants, such as sodium silicate
or Darvan, can be added to the slip to disperse the raw material
particles.
*
A special slip called “casting slip”
is used with mold-made shapes (these have a specific recipe).
*Slip
is often used in decoration. It may be left the natural color of the clay body from which it is made, or it
may be colored with mason stains or oxides. If colour is important, then a
white slip is used.
*It is applied to wet or soft leather-hard greenware. (Slip used on bisque usually
follows an engobe recipe).
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Kathy
Triplett:
“Slips made from slurry will shrink much more than
those made from casting slip, they won’t adhere as well unless special
ingredients are added to minimize shrinkage…Add 3%-5% ceramic stains to any
casting slip recipe”.
In Handbuilt
Ceramics by Kathy Triplett ( p. 141)
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Uses of Slip
A slip may be
made for various purposes in the production and decoration of ceramics. Slip
can be used:
1.
To join of sections of unfired ware or greenware,
such as handles and spouts (this may simply be a wetter version of the clay
you are using or one with the addition of darvan or sodium silicate).
2.
Decoratively by adding mason stains –
what you see is what you get (usually no more than10-15%). Traditional slipware uses oxides.
3.
To pour into a mold to create a form and called slip casting.
4.
To adhere figures or other
motifs to unfired ware, called sprigging.
5.
To repair cracks in your greenware (with the addition of toilet paper)
6.
A specialized slip (engobe) is used to further decorate a
bisque piece.
Application of underglaze slip
Underglazes can be applied by brushing, pouring, dipping, spraying,
sponging—pretty much anything goes. Each application method has different
requirements. If an underglaze is too thick for spraying or using as a wash,
just add water to thin it down. If it’s too thin for silk screening or
monoprinting, leave the container exposed to air to evaporate some of the
liquid.
RECIPES
Low fire - white slip (cone 05, 06)
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Carol Gouthro – low fire white slip (cone 05, 06)
EPK 12.5
Calcined Kaolin 12.5
Ball Clay 25
Frit 3124
20
Talc 5
Silica 20
Zircopax 5
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Robin Hopper: WHITE BASE
SLIP
(will fit most clays & easily
colored, cone 04-12 in Ceramic Spectrum):
Ball clay 75
Kaolin 10
Silica 10
Feldspar 5
(at cone 2 or
lower it may cause the glaze to craze)
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