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Reflection nebula are coloured blue, emission nebular are coloured red for exactly the same reason that our sky is blue. This is not to be confused with clouds that are lit almost directly (near line of sight) by background stars.
To colour correct your image you need to find a white star (G5-G8 Spectral classification I think) and split out the RGB of the image into layres then adjust until the brightest part of the white star is white (assuming you haven't over exposed that star iun the image). There are charts online that dictate the RGB colour of all spectral types of stars so you can also use these.
Cheers
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