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The secondary often appears green when split in smaller scopes and blue when split in larger scopes. I think this is an artifact of aperture. AS geoff says, there are no green stars. I always get blue/grey in my 10".
A couple of additional tips on top of those Gary Beal provided. It is extremely seeing dependent, let it gain good altitude (which it has at the moment), good collimation helps a lot as do sharp, high light transmission eyepieces. I can usually tell by looking at other stars and how clean they focus, if the seeing is up to splitting Antares. If the seeing isn't good enough I just move on, I don't waste my time with filters etc; same with Nu Scorpii. For those with smaller scopes it is quite splittable under favourable conditions in a high quality 4" refractor.
CS-John B
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