Värvimuut metallist ja terasest pinnal on tavaliselt põhjustatud toatemperatuuril oksüdeerumisest, kuumuse mõjul tekkinud värvimuutusest tootmise ajal või veest pärinevatest mineraalladestustest.
Discoloration on a metal and steel surfaces is usually caused by oxidation at room temperature, heat-induced discoloration during manufacturing, or mineral deposits from water.
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