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G'day Graeme, that is right, it would be unnecessary.
In fact my tests show that the efficiency of a grayscaled flat is diminished anyway, regardless of any effect on final colour balance.
This whole thing is probably not an issue for those using a constant light source, only those using either the direct sky light or reflected sky light, such as using a T shirt in daylight on field trips.
In Ron Wodaski's book, he suggests pointing the scope at an area under a tree or similar. That is fine for monochrome imagers, but I think it would be an undesirable variable for use with one shot colour imaging.
Lets see what others are doing,
Doug
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