LOL! Thanks everyone
Yes, colour is always going to be a contentious subject on this one. My unmodified DSLR naturally picks up this aqua green colour, not red. Images that I googled were split fairly evenly between red/orange/warm colour to cool greens.
I can't wait until I get a proper filter set for the SBIG and try it on this object with a fresh perspective - and see what happens.
Frank - I just use Photoshop CS3 - and stack into a smart object. If you are only stacking a small number of files (2 to 5 or so) the stack script will align, rotate and position differently sized images pretty well.