Ho tloha ts'ebetsong ea ho thunya, ho eketsa ferric oxide, manganese dioxide ke mokhoa oa setso, ka mor'a ho itšoara ha 'mele le lik'hemik'hale, o tla etsa silicate e tsitsitseng,' mele oa motho o phetse hantle ebile o sireletsehile; ho tloha ho tsoaloa ha lisebelisoa tsa ceramic hoo e ka bang lilemo tse 20 tsa histori, ha e e-s'o be ...
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