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At high magnification in larger scopes, some observers have reported subtle shading on Uranus, but Neptune would appear as nothing more than a tiny blue ball in amatuer sized scopes.
Ganymede can show some dark features if seeing is excellent and you are using a 10" + scope at very high power. Check Carlos Hernadez's observations on cloudynights - he's sketched Ganymede a number fo times.
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