Which of the following potassium compounds is known as ‘Pearl ash’?

-K2CO3 or potassium carbonate is known as pearl ash.
-Pearl ash, in ancient times, was created by baking potash in a kiln in order to remove impurities. The remaining fine, white powder was pearl ash.
-Potassium carbonate is an inorganic compound and a white salt which is soluble in water.
-It is mainly used in the production of glass and soap.