Kubva pakupisa, kuwedzera ferric oxide, manganese dioxide inzira yechinyakare, mushure mekuita kwemuviri uye kemikari, ichagadzira silicate yakagadzikana, muviri wemunhu une hutano uye wakachengeteka; kubva pakuzvarwa kwemidziyo yeceramic inoda kusvika makore makumi maviri enhoroondo, haisati yave ...
Verenga zvimwe