Vintage orange / red glazed earthenware ashtray made of chamotte clay

Vintage orange / red glazed earthenware ashtray made of chamotte clay. 

Cheerful vintage 60s ashtray made of dark brown chamotte clay. This robust ashtray stands on four sturdy legs. The surface on the inside is red / orange glazed. Beautiful eye-catcher for on the table in a retro living room.

Sturdy and fairly heavy ashtray. * Misses a small piece of chamotte at the bottom (photo 4.)

• Height: 5 cm.
• Length: 20 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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