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Thank you for your help Ivo.
I found one cause of my problems yesterday, which may help other people also.
I take the image using Nebulosity. Then I attempt to open it up in AstroArt. It is at this point that the orange, or mauve cast is introduced.
So now I use only Nebulosity and the results are MUCH better.
There seems to be some difficulty - which I dont understand- about transferring colour FITS files.
Live and learn!
The attached file of M51 was processed in Nebulosity. Taken with the 10" RC, plus Intes focal reducer. I managed to clout the telescope halfway through the exposure! Background is a bit light, but its a balance between that and getting as much detail as possible from the subject.
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