Grog (clay) Grog, also known as firesand and chamotte, is a ceramic raw material. It has high percentage of silica and alumina. It can be produced by firing selected fire clays to high temperature before grinding and screening to specific particle sizes. It can also be produced from pitchers.
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Because the shoes had a soft rubber sole, they became known as sneakers as the rubber soles allowed sneaking around silently. By the early 1920s, the shoes were worn by Olympic soccer players, national and international tennis champions, and college athletes. In 1926, the Keds Triumph shoe was introduced.