I've never heard of burning/melting metal
with light - maybe when a metal is burning it
gives off a bright white light? If this is the
case, it's a chemical reaction, where one of the
products is light. For example, when you add
heat in the form of a flame (match, lighter,
etc.) to a piece of paper, the products are ash,
light, and heat. One metal that gives off a
bright white light when heated is magnesium.
Often scientists (especially astronomers) use
the results of flame tests to find out what
stars are made of. *More information can be
given if this answers the question*
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