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What are Underglazes?
Originally underglazes, refer to ceramic colors used
under-the-glaze, like a foundation. Now the term generally refers to a
product put on greenware that is covered with a clear glaze. Underglazes
can be translucent or opaque. Opaque underglazes are generally used for
large solid area coverage. They are opaque and will block out other
underglaze colors over which they are applied. Underglazes are
occasionally used in a specific technique with no covering glaze. The
translucent types are referred to as One Strokes and are usually covered
with a glaze as well.
How do I use Underglaze?
For best results, Underglaze should only be applied to greenware, as it
adheres better and flows more smoothly on greenware than bisque. Be sure
the greenware is free from dust to avoid pinholes. Use a wet sponge, a
water saturated brush or a spray bottle to dampen the piece, taking care
to not over sponge or polish the surface; this will cause improper
adhesion of color to the clay. Shake and stir contents of the Underglaze
jar. Choose a soft, suitably sized oval or flat glaze brush for the area
being decorated; spots and streaks may occur when too small brush is used
on larger surfaces. Sometimes the shade and texture will vary with
different thicknesses. To apply the underglaze, load brush and apply with
flowing strokes, reloading your brush often. Be sure to brush out overlaps
before they dry and allow the sheen to disappear before applying the next
coat. Applying each coat evenly in different directions can help eliminate
thin or missed areas. Always apply the number of coats recommended on the
label.
How do I fire Underglazes?
Mayco Underglazes are designed to be fired to shelf cone 04 and then clear
glazed and refired to shelf cone 06, if desired. If Underglazes are not
fired hot enough in the greenware fire, the color will be weak and less
intense, so it is important to use shelf cones for best results. Most
Mayco Underglazes work well when applied to stoneware or porcelain and
fired to cone 06. For more information, please see Mayco's High Fire Guid
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