potash

The water-soluble part of wood ash, used for making soap and glass and as a fertilizer (chemically speaking, an impure form of potassium carbonate (K₂CO₃) mixed with other potassium salts).

Potassium. Chiefly used in the names of compounds of the form "... of potash".

permanganate of potash

A class of potassium minerals, of similar applicability to potassium carbonate, such as being a fertilizer. (ie. potassium chloride, potassium hydroxide)

To treat with potassium.

In order to ascertain the difference between the rapidity of pickling when the tin frames had been potashed and pickling without such treatment, two batches were used.

Gold ornaments are sand blasted or steel brushed nicely, then potashed,

A surname.