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It's been really fascinating reading everyones responses here. Unfortunately I am not able to get away to dark skies very often with my c14, and certainly from my urban locations there is practically zero possibility for seeing colour through the eyepiece - with the exception of a couple of planetary nebula and the Homunculus- so bright that a deep orange / tangerine colour can be clearly seen in the hourglass shape of the bi-polar emission.
Travelling to a B4 location, I can see plenty of green in say the NGC2070, M42. At a B2 location those colours just come to life and with plenty of blue, and yes, just a hint of pink in M42. I remember when I was in Coona last year, spending some time attempting to see the horsehead without success (even though the flame was very pronounced). I understand that this target relies on your eyes being able to pick up the surrounding red Ha emissions to be able to identify the 'hole' in them. Could have been sky conditions, or my eyes just not up to the task... but after reading Alex's comments on exit pupil that could be a factor too
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