minium

Perhaps the most interesting experiment made by Hales is the heating of minium (red-lead) with the production of oxygen.

Native minium or red lead, has an earthy aspect, of a lively and nearly pure red colour, but sometimes inclining to orange.

The best minium, however, called orange mine, is made by the slow calcination of good white lead (carbonate) in iron trays.

The battery is composed of two sheets of lead, which are covered with a layer of minium (Pb3O4).

Nor shall thy title be marked with minium, nor thy leaf scented with cedar-oil.