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The 780-790nm range is very much on the visible limit I believe, and basically near infra-red. A quick google gave me this link for instance:http://en.wikipedia.org/wiki/Visible_spectrumIf you accept you can't see the laser then that covers the why not black ink question too I think.
The 780-790nm range is very much on the visible limit I believe, and basically near infra-red. A quick google gave me this link for instance:
http://en.wikipedia.org/wiki/Visible_spectrum
If you accept you can't see the laser then that covers the why not black ink question too I think.