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A #80A blue filter will reduce the brightness of the white bands and cause darker markings to pop out.
It will tint the planet blue, which most people don't like, but it will cause darker markings to become more visible.
It also works on Venus to reduce light scatter in the eye, and on the disk of Saturn to make the bands stand out.
By narrowing the wavelengths tranmitted it also helps reduce the effects of poor seeing, too.
All that said, I find my most-used color filter is a #15 yellow because it substantially tunes up contrast on the Moon and Saturn's rings.
A real fusbudget in optical image quality, however, is unlikely to be impressed by any colored filter, though. I have tried hundreds of filters, and nearly every one I've tried has reduced image quality in one way or another. So if you get a color filter, get a higher-end one like Lumicon and pass on the inexpensive Chinese ones.
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