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Potash, or potassium sulfate, is currently mined in regions including Carlsbad, New Mexico and at Utah’s Bonneville Salt Flats, where the Bureau of Land Management also oversees a private company’s potash mining operations.

Of the eight cars, he says three carried wood pulp, three carried potassium sulfate and two were empty lumber cars.

The distillation process at Concept Sciences involved mixing several hundred pounds of hydroxylamine - described in chemical industry literature as “thermally unstable” and capable of spontaneously igniting in the air or on contact with copper or other metals - with potassium sulfate.

Court records indicate the device was a jar filled with ball bearings and about four ounces of a green explosive powder containing potassium sulfate and other chemicals.

Becquerel wrapped photographic plates in black paper, placed a sample of phosphorescent uranium potassium sulfate on top of it, and placed it in the Sun.