There are several ways that heat can be
transmitted, but in this case we're talking about
light, so it's helpful to talk about radiative
heat, which is transmitted through infrared
radiation that is invisible to our eye. In
general, the colour of something might not be as
significant as the general material of an object.
(For example, is it metal, is it plastic, is it
wood?) However, you could do a simple experiment
with black and white paper. On average when
compared to black paper, white paper reflects more
light, so it absorbs less energy from visible and
near-visible light. Because white paper absorbs
less energy, it may not get as hot.
This is a somewhat strange question to answer
because paper is commonly known as being an
insulator. That is, paper is a type of material
that reduces the amount of heat transfer from one
object to another. Perhaps what you want to know
is more along the lines of what color paper will
absorb the most thermal energy? In that case,
black paper is the best at absorbing
electromagnetic radiation because it approximates
a black body absorber. You can read more about it
on Wikipedia's page concerning black bodies:
Hope that helps!
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