“Germany's chief natural resources are iron ore, bituminous coal and lignite, potash, timber, lignite, natural gas, salt, and nickel.”
“The leachate was collected and then chemically converted to true saltpeter, potassium nitrate, by mixing it with a solution of potash.”
“It could also be treated by rubbing salt, brain or potash alum into the surface to produce a very pale leather.”
potassium
A soft, waxy, silvery reactive metal that is never found unbound in nature; an element (symbol K) with an atomic number of 19 and atomic weight of 39.0983. The symbol is derived from the Latin kalium.