Yo refere a diferan kalite pwosesis tretman sifas fret. Pami yo, 2B ki te fome pa woule fret -- rwayaj elve-nivo, pandan ba yo fome pa fret woule ---nivo rwayal- nivo. Diferans prensipal la bay manti nan diferan processes.BA klere annealize, sifas la pa oksidize, pi klere.
