There is an interesting witness on this month's "whats up" (Eridanus) http://www.cloudynights.com/item.php?item_id=1734 .
The author, who did not participate to this thread, reports seeing NGC1535 with a green centre and a pink fringe. The pink is reported on a 36" scope.
"Using the 36" f/5 Yard Scope and a 12mm eyepiece (360X) shows a bulls-eye of nebulosity, with the inner ring as light green and a light pink outer fringe. "
I have found the following picture of NGC1535 (yes, it resembles the Eskimo nebula). I have also made some search and it seems that the nebula is an OIII object. The outer ring should really be green like in the picture.
Thus this is another case (besides the "ears" of M27) where reddish is reported in place of OIII.
In fact the theory that "every time an expert observer sees a color, it has to be real" is contraddicted once again.
On the countrary, as the studies I pointed tell, the theory that "medium lights are contextually perceived as red" is reinforced by this observation.
Note that M27 and NG1535 are relatively bright nebuale. I do not exactly know how bright are the ears of M27 or the external shell of NGC1535, but it is clear that at that level (relatively bright) red is no longer correctly identifyed.
I believe that the alternative theory that "we shift from real colors to colors mapped onto brightness levels" is strong (not all people map different levels of light in false colors: as the studies show, some simply map them in gray levels).
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