Potash
Potash (especially potassium carbonate) has been used in bleaching textiles, making glass, ceramic, and making soap, since the Bronze Age. Potash was principally obtained by leaching the ashes of land and sea plants. [citation needed]Beginning in the 14th century potash was mined in Ethiopia.One of the world's largest deposits, 140 to 150 million tons, is located in the …