Significados de powder nitre en inglés

As in orange ochre, powdered nitre may be employed in its preparation.

A redder hue is imparted by mixing the ochre with powdered nitre before ignition, the orange red being subsequently washed with hot water.

Powdered nitre moistened with water and applied to the face night and morning, is said to remove freckles without injury to the skin.

The refining flux is made by mixing 3 parts (by measure) of powdered nitre, 2-1\2 of tartar, and 1 of salt.