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Green is the easiest colour to see in low light, and I often see green in the Orion Nebula, so you are not imagining things. If you want to see pink or red in Orion then a 16" or larger is helpful, but not foolproof, it will still be very subtle colour.
People's eye vary in how sensitive they are, and what colours they see - I always tell the story that it took me a year to see colours in the stars. I kept reading about how different stars were yellow or orange or red, but they all looked white to me. But after a year of observing and training my eye to was was 'normal' for the sky I started to see the different shades.
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