I've been around way too long to know or not to know what I'm seeing.
In my 22" it is apparent in M-42.
In my 6" refractor a greenish tint, with a hint of different contrast of color (like almost brownish) in the areas where the salmon pink is seen in the 22".
The pinkish color I reported last year in my 8" refractor on a superb night was seen not only by me, but other observing partners who are quite skilled observers.
Lots has to do with the observer, scope, eyepieces, and of course sky conditions. So as David has pointed out, many skilled observers have reported pinkish color. So we should at least believe that it is quite possible.
Karl E.O.H.
Chesmont Astronomical Society Telekit (Swayze optics) 22" F/4.5 Dob Homemade (Parks Optics) 12.5" F/4.8 Dob TMB 8" F/9 Refractor(The Beast) Antares 6" F/6.5 Refractor(Mini-Beast)
-------------------- So many galaxies, so little time!