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I've observed M42 on a few occasions under dark skies through my 120mm f5 refractor and I see a blue/grey centre with purpleish outer. I was very surprised to see any colour the first time I observed it as I'd never seen any colour in anything else I'd observed before (not that that's too much as I'm not much of a visual observer). I've never seen any green in it though and I see more saturation in the purple than the blue - which is basically just a cool grey colour.
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