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This is more so a question of how light interacts with matter. For example, why are substances like oxygen generally invisible? If the light hitting the molecules were absorbed, it would appear black, right?

Also, could we create invisible materials?

Sir Cumference
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    Well, that just means that oxygen does not absorb in the visible region of the spectrum. – orthocresol Dec 15 '15 at 00:09
  • http://chemistry.stackexchange.com/questions/16633/why-is-gold-golden – Mithoron Dec 15 '15 at 00:16
  • Mankind has done so since ancient times. Glass is effectively invisible, hence why silly insects keep flying against it. – Jan Dec 15 '15 at 00:18
  • Invisible to all wavelengths of electromagnetic radiation, and all sorts of particle beams? - No. // Invisible to a certain range of the electromagnetic spectrum (like human eye range)? - Yes. – MaxW Dec 15 '15 at 00:37

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