thal tshwa

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ཐལ་ཚྭ
burnt salt [JV]

(med) Ashes, contains potassium carbonate, calcium carbonate, phosphates and traces of other elements. Synonyms : ldum tshwa, sdong tshwa (Yeshi 2018).
See also alkali, ba tsha : the calcined ashes, referring to the original source of alkaline substances. A water-extract of burned plant ashes, called potash and composed mostly of potassium carbonate, was mildly basic. After heating this substance with calcium hydroxide (slaked lime), a far more strongly basic substance known as caustic potash (potassium hydroxide) was produced (wikipedia). Johannes Schmidt (talk) 18:20, 22 November 2021 (UTC)