[Stosh]

So if excited hydrogen atoms emit light at four wavelengths in the visible, does excited anti-hydrogen emit dark?

[BipolarBob]

and just what is the speed of dark, anyways?

[Boogieman]

Yes, and if we make a copy of you out of antimatter, it would look just like you, except it would have a mustache and goatee and would be evil.

[dr_lew]

So if excited hydrogen atoms emit light at four wavelengths in the visible, does excited anti-hydrogen emit dark?

No. As photons are neutral, the spectrum of anti-hydrogen should be completely indistinguishable from that of hydrogen, certainly as to wavelength. Polarization is another question.

[mad_as_he$$]

http://lindberglce.com/tech/darkons.htm