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“You carried oil of vitriol knocking about in a sack? It is infinitely dangerous, my boy.”

Medieval alchemists called sulfuric acid “the oil of vitriol.”

A. The action of iron or zinc scraps on diluted oil of vitriol is among the best.

Ink spots can be removed by scouring them with sand, wet with water that has a few drops of oil of vitriol in it.

Whether we believe or not that a piece of clean iron immersed in a mixture of oil of vitriol and water, evolves hydrogen gas, the fact itself remains unaltered.