is the common name of potassium carbonate
), a substance that has been used since antiquity
in the manufacture of glass
, and as a fertilizer
The name comes from the English
, referring to its discovery
in the water
of wood ash
The term has become somewhat ambiguous due to the substitution in fertilizers of cheaper potassium salts such as potassium chloride (KCl) or potassium oxide (K2O), to which the same common name is now sometimes also applied.
The element potassium derives its English name from potash.
Caustic potash is the common name of potassium hydroxide (KOH).