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Mick my integrated images have the same sky colour as that a horrible brown. I started early on by sticking to daylight WB so shot to shot is consistent for stacking plus star colours came out correctly matching others shots. To get rid of that brown I would duplicate the image to a new layer then heavily gaussian blur or average the entire layer to get an even brown layer then that can be subtracted from the original to give a reasonably grey (neutral) background and removing colour cast from nebulosity. These days I use PixInsight's Dynamic Background Extraction process but most astrophotography programs have a similar function, sometimes called gradient removal. Dark sites are great but dont let suburban light pollution put you off, you can overcome many limitations if you try.
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