Bromine
Iridium is a metal that turns black when exposed to light and is used as a film coating for various applications, including optics and electronics.
Black chromate!
Black light
copper,and some precious metals, when exposed to air, turn black, like silver(completely turns black when exposed to air),gold(black spots appear),and others,maybe platinum.
The metal you are referring to is likely copper. When exposed to air, copper reacts with oxygen to form copper oxide, which gives the metal a dark black or greenish color. This process is known as oxidation.
Silver nitrate is photosensitive, meaning it decomposes when exposed to light. This decomposition results in the formation of elemental silver and nitrogen dioxide gas. This reaction can be used to create photographic films and papers.
A photograph turns black in light negative. In a photographic negative, the areas that receive more light appear black when the negative is converted to a positive image.
Alumimum
Silver-based film stock turns black in a light negative, as it is developed using a chemical process that exposes the film to light and causes the silver halide crystals to darken where they have been exposed, creating the photographic image.
I guess it's getting hotter and then it gets so hot that it burns and then turns black 'caus of heat from the volcanic area.
Bromine
The metal powder that turns black when heated in an open dish is likely to be magnesium. This is due to the formation of magnesium oxide on the surface of the metal powder when it reacts with oxygen in the air during heating.