Chromatic Aberration - Purple Fringing

I've tried trawling the web and the Apple help for this but to no avail. I have a few random photos trying out new lenses which are coming up with purple fringing. Using other image editors I've been able to get rid of it, but the CA tool in Aperture 3 doesn't have purple - I'm sure you could make it from Red/Cyan and Blue/Yellow but not with just two sliders so I've been unable to get rid of it without resorting to exporting or lots of different desaturating tips and tricks. I found the halo adjustment brush but that seems burn the image while it removes the halo, so all in all I'm not having much luck.
Has anyone found a good process for removing purple fringing in Aperture 3? If so I'll pay good points for help.
Thanks all, James

Hi Kirby no I don't see the same in RAW shots with the same lens/body combo. It may be that Aperture's RAW converter is doing a great job and removing the CA before I can see it, or it may be that it was just the light / f-stop / shutter speed that day which contrived to give such obvious fringing around the blond hair of my son. I'll post some pics tonight to show you what the jpeg looks like, but I've been unable to find any in my RAW files.
I do convert my older RAW's to jpegs after I know I'm done editing / marking / scoring / printing them so I can't even go back to older photos and slide the RAW setting back to see if the fringing appears again. Sorry. If we ever see the sun again here in the UK I'll do some test shooting in the garden again and see if I can re-create it.
Thanks both. James

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