Uhereye kubikorwa byo kurasa, wongeyeho oxyde ferric, dioxyde ya manganese ninzira gakondo, nyuma yimyitwarire yumubiri nubumara, bizakora silikate ihamye, umubiri wumuntu ufite ubuzima bwiza numutekano; kuva havuka ibikoresho bya ceramic hafi yimyaka 20 yamateka, ntabwo yabaye ...
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