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While digging and firing clay for a previous project, I discovered that certain clays, when fired with transparent lead glaze, turned green. Clay collected from Seaham Cliffs turned a buff, pink colour when fired to 1050°C and a buff, yellow when fired to 1100°C and at both temperatures, the glaze became a green shade, though slightly more blue toned at 1050 °C. Clay collected from Southport beach was back after processing, likely due to the coal and oil deposits off-shore an