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I don't trust the Wiggles at all, I mean, the 'blue wiggle' is 'Tah' blue, which is a mutation of original blue aka, Force Blue. Now, wouldn't the Blue wiggle actually be original blue and not some knock off Tah Blue, that fact destroys thier credibility already. Also I found a better quality picture that shows the 'purpleness' of the Purple wiggles jumper a bit more appropriately.
Anyway, in conclusion, the Blue Wiggle is wearing the mongrel of the colour blue, being Tah Blue while the Purple wiggle is clearly wearing a purple colour which is not the same colour as that of the Force, which wear original blue, a nice dark blue is the way god intened is, a primary colour and all. And to some up, look at the background of the picture, that is Force Blue. The picture you posted was at night-time therefore darkness affected it to make it a deeper blue.
PS. Moses, you should become a member of the Force like the picture you posted suggests, the Force pretty much rock.