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PKQothW 40

  1. When doing _________________ decoration on bottles and closed forms, it is important to choose a clay type and thickness that will keep its shape.

    1. engobe

    2. incising

    3. impressed

    4. underglaze

  2. Agate, and agate paste are techniques that require the use of two or more colored clays. The ___________ technique requires slight wedging of the clays together. Whereas, the ___________ technique is more of an assembly of the clays, thus more controlled.

    1. Agate paste, agate

    2. Engobe, agate paste

    3. Agate, agate paste

    4. Agate, engobe

  3. ______________ overglazing is one technique used to overglaze pottery that has already been fired. Using solvents from ceramic suppliers, the oxides and solvent are mixed on a glass plate and then painted onto the glaze fired piece.

    1. Glue based

    2. Oil-based

    3. Lacquer based

    4. Rubber cement

  4. _________________ is a technique used to separate colors from each other on a piece, usually flat. It involves mixing manganese dioxide and a dry transparent glaze in a mortar and adding this black dust to turpentine with turpentine oil. This is then painted on to the piece before other colors are applied.

    1. Mishima

    2. Sgraffito

    3. Paper resist

    4. Cuerda Seca


 

This weeks Pottery Quiz of the Week questions come from: Ceramic Class: Decorating Techniques, Joaquin Chavarria,c. 1999, Watson Guptill Publications/New York


 

Note from Pres: This is the second book out of a series of four in this Ceramics Class. All of them are quite thin, and quite packed with information. Excellent resource for any library.

 

Answer Key:

 

  1. 3. impressed- Because the pieces have to be soft for the impression to be effective, they should be handled with care. Also, with open forms (such as bowls or boxes), it is necessary to support the walls on the inside so that they do not become deformed. With closed forms (bottles, vases, and the like), be sure to use a clay type and a thickness that will keep its shape.

  2. 3. Agate, Agate Paste-paraphrased from the text. Pp.14-15

  3. 2. Oil-based-This variation of the previous process is used to decorate pieces covered in glaze that have already been fired. Before beginning the decoration, the piece must be clean, dry, and dust free. The design can be transferred onto the piece using carbon paper. The colors are mixed with 2O to 30 percent of an oil solvent, which is available from ceramics suppliers. You can also use turpentine essence, which can be diluted with a little turpentine if it is very thick. Mix the colors with the oil on a sheet of glass, using a palette knife, until they reach a uniform, fluid consistency. Besides a paintbrush, a pen and nib are also very useful for drawing the design. In this case the color should be dissolved a little more and the nib cleaned, since the color will dry very quickly, preventing it from marking the image. It is easy to correct mistakes with this kind of deco» ration because the glaze does not absorb the color; simply remove it by scraping it off the surface and paint over it again.

  4. 4. Ceurda Seca-This method is used to separate glazes of different colors and to prevent them from mixing. It is prepared using manganese dioxide, adding about 15 to2O percent of transparent glaze; mix the materials in a mortar. The result is a black dust that is then mixed with turpentine diluted with turpentine oil; this enables paintbrush to move easily over the bisque surface. Since the mixture evaporates rapidly, just prepare it as you need it, making only a little at a time. The left- can be kept in a closed container, covered with a light layer of turpentine. Other oxides and pigments can also be used. After firing, check whether the cuerda seca stains, by passing a finger over it. If it does, you have to apply the cuerda seca again, increasing the percentage of flux. Before glazing check that the pattern you have made using this process is completely dry, so that the glaze will not be discolored by absorbing part of the damp cuerda seca.

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I guess my time off let me clear the cobwebs, as this seems to be tougher for folks. Keep on trying, and while your at it . . . think things through as at least two questions almost answer themselves.

 

best,

Pres

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