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The lack of colour is probably due to too much light gathering by the scope!! Sometimes you can get too much of a good thing. If this is a problem try a simple offset mask on your scope.
Get a bit of cardboard and set it up to cover the front of your scope. Cut a 4" hole on one side and see if that helps with the colour. It effectively turns your 12" f5 into a 4" f15 which would be a great planetary scope. I do this with my 8" scope on the moon to great effect, Jupiter is not so much a problem with an 8" scope.
Worth a try anyway and would like to hear of the success or failure of the experiment.
Cheers
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