2. Introduction
• Ceramic glaze is an impervious layer or coating of a vitreous substance which
has been fused to a ceramic body through firing.
3. 4 Ceramic Glaze Ingredients
• Silica (or industrial sand) is the key ingredient in glass, raw clay, and
ceramic glazes. silica's melting point (approximately 3100 F or 1710 C)
• Alumina: The Refractory Nearly all glazes contain alumina, or
aluminum oxide, which acts as a stiffening agent. alumina enhances
pink hues used in coloring the final piece.
• Fluxes play the key role in lowering the melting point of silica, making
it usable in ceramic glazes.
• Colorant: The Beautifier Once melted, silica is transparent, making
colorants necessary in order to achieve the wide range of hues that
make decorating pottery with glazes so rewarding.
4.
5. How to Mix Glazes for Pottery
• Glaze Components
• Use Glaze Recipes
• Necessary Mixing Tools
• Mixers for Glazes
• Measure the Glaze Ingredients
• Mix the Dry Ingredients
• Add the Water
• Mix the Wet and Dry Ingredients
• Once the Glaze Is Mixed
• Storing the Glaze Batch
6. 5 Easy Ways to Glaze Pottery
• Dip Pots into Glaze-Dipping pottery into a fluid glaze, about the
consistency of heavy cream, is one of the fastest ways to glaze large
quantities of pottery
• Pour Glaze In and On- Glazes for pouring need to be the same
consistency as dipping glazes and is often done in conjunction with
dipping.
• Brush Glaze On- These glazes tend to be much thicker in consistency
than dipping and pouring glazes.
• Sponge Glaze On- Sponges can be used at nearly every step of pottery
creation, including glaze application
• Spray- guns and airbrushes are two tools which potters use to spray
glazes onto their pottery.
7.
8. Ceramic and Glaze Colorants
• Chrome oxide can yield a variety of colors: red,
yellow, pink, brown, and especially green.
• High magnesia content, very small amounts of cobalt
can give a range from pink through blue violet.
• Cobalt with manganese and iron will yield an intense
black.
• In fluid glazes, rutile encourages opalescent blues.
• At cone 6 and above, manganese produces brown.
9. Second firing
• The kiln is heated slowly to the
proper temperature to bring the
clay and glazes to maturity
• Then it is slowly cooled again.
• The kiln is opened and unloaded
after it has cooled completely.
• This second kiln firing causes a
remarkable change in the clay
and glaze
10. Very Low-Fire Range-
• from cone 022 (approx. 1112⁰F - 605⁰C)
• to cone 013 (approx. 1566⁰F - 850⁰C)
Low-Fire Range-
• from cone 012 (approx. 1623⁰F - 882⁰C)
• to cone 02 (approx. 2048⁰F - 1120⁰C)
Lower Mid-Range Range
• from cone 01 (approx. 2079⁰F - 1110⁰C)
• to cone 3 (approx. 2134⁰F - 1145⁰C)
Firing range
11. Mid-Range
• from cone 4 (approx. 2167⁰F - 1165⁰C)
• to cone 7 (approx. 2264⁰F - 1210⁰C
High-Fire Range
• from cone 8 (approx. 2305⁰F - 1260⁰C)
• to cone 14 (approx. 2530⁰F - 1390⁰C)
• the color range is limited. Because of the varying effects of
oxidation and reduction on glaze colorants, if much more
limited, palette.
