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Many of the records come from the Confederate nitre and mining bureau, which was set up to produce saltpeter, among other things.

They were in a long, dim cellar with barrel-vaulted ceilings, its stone walls spotted with nitre.

The walls were discolored with patches of nitre.

He remembered walls of pale red stone festooned with patches of nitre, a grey door of splintered wood, four inches thick and studded with iron.

After this, reduce for a few days the amount of the animal’s food, and administer a small portion of nitre and sulphur in each morning’s meal.