Pa610 brush terata, e na le sets'oants'o se batlang se le nyane, ho monya metsi a manyane, ho hanyetsa alkali e matla le acid e fokolang, ho hanyetsa abrasion le ho hanyetsa mokhathala, joalo-joalo, e sebetsang ho mefuta e fapaneng ea borashe ba indasteri, joalo ka: moqolo oa borashe oa litholoana le meroho, khalase. borashe bo benyang, joalo-joalo, alth...
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