Kusukela enkambisweni yokudubula, ukwengeza i-ferric oxide, i-manganese dioxide kuyinqubo yendabuko, ngemva kokusabela ngokomzimba namakhemikhali, kuzokwakha i-silicate ezinzile, umzimba womuntu uphilile futhi uphephile; kusukela ekuzalweni kwezinto zikagesi zobumba cishe iminyaka engama-20 yomlando, akukaze kube...
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