Ukususela kwinkqubo yokudubula, ukongeza i-ferric oxide, i-manganese dioxide yinkqubo yendabuko, emva kokuphendulwa komzimba kunye neekhemikhali, iya kwenza i-silicate ezinzileyo, umzimba womntu unempilo kwaye ukhuselekile; Ukususela ekuzalweni kwezixhobo ze-ceramic phantse iminyaka engama-20 yembali, ayizange ibe ...
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