[PKay (Peter)]

I sorta feel like I am standing on a thin branch at the moment :-)

Anyway I combined two sets of images in PI, each integrated separately.
Did the normal background extraction, noise reduction, histogram stretch.

Set 1: 30 of Gain = 50, exp = 240s
Set 2: 30 of Gain = 70, exp = 120s

And yes, I did the photoshop thing pushing up the saturation a bit just for fun.

Admittedly this is a nice bright ish target.

I can only guess if I added another 30 images at exp = 30s even more colour would reveal.

As Colin pointed out, it might help in this debate to offer some examples.