what causes metal to be orange on the surface?
melanin content gold antigens air pollution electrons conductors melanin amount iron oxide
A B C D E F G H
Iron oxide is rust .
when a metal contains iron oxide, it becomes orange on the surface
what causes metal to be orange on the surface? (A) melanin content (B) gold (C) antigens (D) air pollution (E) electrons (F) conductors (G) melanin amount (H) iron oxide