simple thing about clay (泥土的簡介)

earthenware clay (低溫土)

*   red earthenware or terra-cotta is a natural clay,

    it is high in iron so it got a rich rusty colour,

    firing range: 1,000 - 1,180 °C

紅 色陶器或赤土陶器是自然黏土,
因它鐵質含量比較高所以它有氧化鐵(生鏽)的顏色,
燒成範圍: 1,000 - 1,180 .C

 
stoneware clay (高溫土)

*  which is harder and stronger than earthenware when fired.

    If the particles of the clay is fused and vitrified,

    the pot is non-porous even unglazed.

    Glaze is an extra material for hygienic or decorative purposes.

    firing range: 1,200 - 1,300 °C

燒 成時會比陶器堅硬。 如果黏土的微粒被熔合和釉化, 作品就算不施釉也再不透水 。
釉,是特別為了衛生或裝飾目的材料。
燒成範圍: 1,200 - 1,300 .C 

 
porcelain (瓷土)

*  the whitest & purest clay body, which is capable of very high temp firing.

    When pots are made very thin,

    the fired clay itself is quite translucent while hard and nonporous.

    firing range: 1,300 - 1,350 °C

白色最純淨的黏土, 能夠抵受高溫的燒製。
若果瓷土被製成薄胎作品, 燒成後就會有一定程度的透光性,堅硬的胎身密不透水。
 燒成範圍: 1,300 - 1,350 .C