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If you colour enhance the image and then adjust the white balance it shows a predominance of green. I think adjusting in-camera white balance is the first step. Or adjusting WB before stacking the images.
I notice that if you duplicate the image and average the two and then apply white balance, the nebula takes on a purple tinge with a muddy background (like a previous image). There are millions of stars in this region, as far as I know, so it's unlikely that the background will be all dark.
Otherwise WB correction of the image shows lots of pink and red, with surrounding star fields.
Stack with some 1 minute exposures as well, and use darks for thermal signal reduction.
Hope this is of some help!
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