Before smoking, they saltpetre the hams to preserve them and add a subtle tang.

The chemist carefully measured a small amount of saltpetre before beginning the experiment.

When the basement remains damp for too long, the stone wall saltpetres, forming a powdery white crust.

Miners discovered veins of saltpetres that had been forming on the cave walls for centuries.

The old barrels were saltpetred to preserve the meat during the long voyage.

The saltpetrous residue on the cellar walls hinted at old nitrate storage practices.

While saltpetring the wooden beams, the workers noticed white crystalline deposits forming on the surface.

Many industrial historians credit the global fertilizer boom to exports of Chile saltpetre during the nineteenth century.

The chemist carefully analyzed the Norway saltpetre to determine its purity before using it in fertilizers.