Nice John, I took my last 47 Tuc shot there too at the star party.
What processing software do you use?
Even at 5 mins I wasn't overexposing (I think) and getting some colour. As rick says, it usually takes a bit of saturation boosting (masked!).
Also, using your software to normalise the colour balance helps, eg pick an area you 'know' is white & white balance.
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