Koyilo yopangidwa ndi galvanized ndi chinthu chachitsulo chomwe chimakwaniritsa kupewa dzimbiri kothandiza kwambiri popaka pamwamba pa mbale zachitsulo ndi wosanjikiza wa zinki kuti apange filimu wandiweyani ya zinc oxide. Zoyambira zake zidayamba mu 1931 pomwe injiniya waku Poland Henryk Senigiel adachita bwino ...