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Colour in deep space objects, my experience is = generally no.
You can see the colour in planets, Mars red, Neptune Blue Uranus green.
As an exception, You may see some colour in the blue planetary nebula,
But generally the colours you see in, say, the Orion Nebula, the Helix nebula, the carina nebula, for example, can only be picked up by the long exposures obtainable in photography.
Even in a 20 inch Dobsonian.
Visual observations are generally just black and white.
This is due to the colour sensitive areas of the eye(cones) being the less sensitive areas of the eye, while the more sensitive (the rods) are not colour sensitive areas.
Google Rods and Cones
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