Ceramic Glaze
Ceramic Glaze is a form of glass, comprised of oxides
and minerals combined with water. The different oxides and minerals react when
heated to provide an infinite variety of colours, textures and finishes. Glazes
are often commercial produced, although many ceramic artists create their own
to provide unique effects. Glazes can be applied in an endless number of ways
- dipping, spraying, brushing, pouring, layering, etc.
Celadon Glaze
The general name given to a colour range of subtle green to blue-gray stoneware
and porcelain glazes, deriving from iron in reduction.
Temmoku Glaze
The Japanese name for very dark coloured high iron glaze which in reduction
yields a near-black. The glaze "breaks" to an iron-red or brown on
the high points.
Sgraffito
Literally to scratch or scrape. Often refers to the removal of one layer of
slip or glaze to reveal another. But can refer to any procedure whereby a clay
piece is scratched or scraped.
Impressions
A common technique that uses pre-moulded shapes pressed into wet clay to create
an inverted image of the mould on the object. Often, the objects are made of
Bisqued clay and some form of anti-bonding agent
is used to prevent the object from sticking to the wet clay
Additions
A common technique in building clay objects which involves adding details to
a still-wet object. Often, the additions are adhered to the object by "slipping
and scoring" where either water or slip is used, along with shallow scratches
on the facing elements of the object and the addition.
Inlays
An inlay is a method of glazing where an incised pattern or design is painted
over with glaze to fill the incisions. Once dry, excess glaze is scraped away
to leave only the glaze caught in the grooves of the pattern.
Slip Trailing
Slip is clay that has been diluted with water. Sometimes, minerals are added
to slip to give it colour when fired. Slip is used throughout ceramic art and
has many pivotal applications like decoration, as an adhesive agent and can
even be used to dip a form in to create thin, delicate clay objects.