Vintage sixties ceramic ashtray, chamotte

1960s - 1970s ceramic ashtray, chamotte. 

Nice big vintage ashtray in black chamotte clay with a smooth inside of red enamel. This ashtray is in a perfect vintage condition and is a wonderful item for the retro living room. 

• Height: 4 cm. 
• Length: 25 cm. 
• Width: 14 cm. 

Grog, also known as firesand and chamotte, is a ceramic raw material. It has a high percentage of silica and alumina. It can be produced by firing selected fire clays to a high temperature before grinding and screening to specific particle sizes. It can also be produced from pitchers. The particle size distribution is generally coarser in size than the other raw materials used to prepare clay bodies. It tends to be porous and have low density.

Grog is used in pottery and sculpture to add a gritty, rustic texture called "tooth"; it also reduces shrinkage and aids even drying. This prevents defects such as cracking, crow feet patterning, and lamination. The coarse particles open the green clay body to allow gases to escape. It also adds structural strength to hand-built and thrown pottery during shaping although it can diminish fired strength.

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