Porcelain:
Porcelain is manufactured by
combining kaolin clay and petuntse (a felspathic material
from decomposed granite). Both need to be refined and the
quality of the porcelain is determined by the degree of
refinement. After the piece has been moulded and pared down
to the required thickness, it is left to dry and then if
required a design in blue cobalt oxide or red copper oxide
is applied. Sometimes a coloured glaze in white, black,
red or celadon is used instead of a design. Porcelain needs
a high kiln temperature, usually above 1300 degrees, to
fuse the glaze to the body to make it resonant and impervious
to water, and to protect the porcelain from the flames at
such high temperature they are placed in earthenware saggars.
Monochrome porcelain, usually white, is sometimes decorated
with coloured enamels before being re-fired at a lower temperature
(around 700-900 degrees) to enhance the body. Famille verte,
which had a palette based principally on green, was used
frequently during the Ming and Qing periods up until around
1710 after which famille rose, based on pink and purple
enamels, became more popular.
Regions
Jingdezen:
Jingdezen became established as the centre of porcelain
manufacture during the Southern Song and Yuan period, and
still remains so today. Imperial patronage ensured the best
craftsmen were attracted to the area and the finest porcelain
was produced. In fact much of the porcelain made during
the 17th and 18th centuries is still recognised as the finest
ever made. Export porcelain made at Jingdezen was either
transported overland via the Mei-ling pass to Guangzhou
(Canton) or else by boat from Nanking. However, although
blue and white underglaze porcelain was designed and made
at Jingdezen much of the enameling was done to order at
Canton.
Dehua:
Dehua in Fujian Province became famous in the 16th century
for the quality of its white porcelain, Buddhist figures,
although other white items were also made which are now
commonly known as blance de Chine. The porcelain was pure
white and when high-fired the glaze becomes glassy with
a variation of colour from pinkish ivory to pale milky-white.
Swatow: 
Swatow is the name given to porcelain from the region north
of Swatow in Guangdong Province and around Quanzhou in the
neighbouring Fujian province. Due to the softness of the
porcelain items tended to be more robust and are characterised
by a more free-flowing design than the more traditional
designs of Jingdezen. Also they tend to be identified by
kiln grit around the foot-rims. Swatow ware was made for
the S.E. Asian market and also for Japan.
Yixing:
Yixing was the name given to a reddish brown stoneware made
around the city of Yixing near Shanghai in Jiangsi province
which produced a much sought after gloss on the unglazed
surfaces. Yixing is best known for teapots which were often
decorated with incised inscriptions.