ART 186 - INTRO TO CERAMICS
|SGRAFFITO is a term used to describe a technique of ceramic decoration
that involves painting a coat of a colored slip onto a leatherhard pot,
and then carving through the slip to reveal the clay color below. All that
is necessary is that you choose a slip color that is distinctively different
enough in color from the clay body that the contrast will be visible when
the pot is glazed and fired. With the slips that we have at Glendale Community
College, you can use any color on the Long Beach Stoneware and you will
get a contrast. With the B-Mix Stoneware you can use any slip color except
the white slip and you will see a contrast.
Here's how to do it:
1. After your piece has reached leatherhard, and you have finished trimming it, paint a coat of slip onto the pot while it is centered and turning on the wheel. Do not paint the rim. Then invert the pot and repeat the procedure on the back side. Do not paint the bottom edge of the footring.
2. Allow the slip to dry to the touch, and repeat step one, by adding a second coat of the same (or a different) slip to the inside and outside of the pot.
3. Allow the slip to dry to the touch again. It will take longer this time. Be careful in handling the piece now, as it has absorbed water from the slip and will be softer and more easily distorted!
4. After the second coat of slip has dried to the touch, you may begin to carve designs. You may band circles onto the pot while it is centered and spinning on the wheel, or just free hand carve, or both. Designs may be lightly carved at first with a needle tool so that changes can be made. If your design is one that repeats symmetrically, it is best to outline a grid on the pot before carving. This will be demonstrated for you.
5. After carving is complete, put the piece on the greenware carts for drying and bisque firing.
6. After bisque firing, glaze the piece simply with a transparent or semi-transparent glaze so the carved design will show through.
T''zu-Chou vase, Chinese, Sung Dynasty (11th-12th century AD) sgraffito carved through a white slip to a stoneware body
Harrison McIntosh, USA, Plate, 1978
Stoneware Plate with Sgraffito design