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

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

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

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

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

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

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

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

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