thang tsha

(med) Alkali, potash, from wood ashes
thang tshas [386] 'bras 'dul nyes pa gsum ka skyed / ces par / rang byung pas / thang rgan tsha yis rma 'bras gcod / ces gsungs pa ni / thang shing gi rtsa ba'am sdong dum rul pa las chags pa shing gi tsha yin te / 'di nyi ma mi phog pa'i rlan can phyugs kyis zos na dug par 'gyur bas bas de / la thang khrag dang ha bo cha mnyam bskol thang dron mo btang bas phan pa'o // (Shel gong shel phreng, pdf p 385.6)

Contains potassium carbonate, calcium carbonate, phosphates and traces of other elements. See also thal tsha.
Johannes Schmidt (talk) 13:01, 26 February 2024 (EST)