We don't have synonyms for pearl ashes yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are pearl ash and pearlfishes.
(n) :
Alternative form of pearlash. [(organic chemistry) A white amorphous or granular substance which consists principally of potassium carbonate and has a strong alkaline reaction. It is obtained by lixiviating wood ashes and evaporating the lye, and has been an important source of potassium compounds. It is used in making soap, glass, etc.]
(n) :
Alternative form of pearlash. [(organic chemistry) A white amorphous or granular substance which consists principally of potassium carbonate and has a strong alkaline reaction. It is obtained by lixiviating wood ashes and evaporating the lye, and has been an important source of potassium compounds. It is used in making soap, glass, etc.]