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Originally Posted by AndyCalling
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Nonsense snipped...
Infra red, being close to visible light in the electromagnetic spectrum, behaves very much like light and can be reflected or absorbed.
With light, the variation in different objects reflectivity of different wavelengths gives the perception of colour. Surfaces highly reflective to all wavelengths of light look 'silver', less reflective look 'white', less again look grey (more than 50 shades!) through to black which reflects very little. Surfaces only look to have colour if the reflective property is in some way non-linear i.e. some wavelengths reflect better than others.
Any radiation not reflected is absorbed by the object - For infra red this absorbed radiation heats the object up.