Kuchokera pakuwombera, kuwonjezera ferric oxide, manganese dioxide ndi chikhalidwe cha chikhalidwe, pambuyo pa zochitika za thupi ndi mankhwala, zidzapanga silicate yokhazikika, thupi la munthu limakhala lathanzi komanso lotetezeka; kuyambira kubadwa kwa zida za ceramic pafupifupi zaka 20 za mbiriyakale, sizinachitike ...
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