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Hi Bruce, colour perception of very faint objects is a bit of a combination of physiology (how good your eyes are and the function of the light and colour receptors in your retina - "rods" and "cones" though I can never remember which is which) and practice. Many observers report that the more and longer they observe objects such as M42 the more colour they see, even the pinks as well as the green - not that you'd ever see the same vividness of colour that images bring out.
cheers,
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