ba tshwa

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བ་ཚྭ
alkali, [soda] salt, salty [IW]

salt [ocean] [RY]

alkali, soda, sea water, impure soda incrusting ground near salt lakes [JV]

alkali, soda [RY]

(med) Alkali, Alkaline soil (Drungtso 1999). Synonyms : ba tsha. Skt.: śorā (wisdomlib.org)
ba tshas chu 'byed thur du sbyong bar nus / zhes pa gad grog las chags pa snum 'bol rlan can ze tsha'i rgyu 'dra ba la tsha bro ngan che yang mer bsregs na ze tsha ltar mi khol ba yin // (Shel gong shel phreng, pdf p 385.5)

Illustrations : 'Phrin Las (32_087) na khar chags pa'i ba tshwa

From arabic al-qualy, ashes of saltwort. Any strongly basic substance, such as a hydroxide or carbonate of an alkali or alkaline earth metal (e.g., sodium, potassium). Alkaline soils are usually clays with a pH above 8,5. Alkaline or soda lakes are caracterized by a high pH of 9-12 and a high concentration of carbonate salts. The tibetan plateau counts some 250 alkaline lakes, of which lake Zabuye in the Kailash region became the principal source for Lithium in China (mindat.org, wikipedia).
Johannes Schmidt (talk) 09:10, 26 February 2024 (EST)