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I bought my Gascans with no intention of wearing them, due to purple being a little girly for me.  I was wrong.  The color is very impressive, and I've gotten nothing but compliments on the color from friends and coworkers. 
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I have to say the image of the Grape Gascan above is not indicative of the true color of the frame.  It looks better in the flesh.  It is more of a cross between black and purple in color.  I am thankful for this fact, because a straight purple frame would look a little "Kool Aid" for me.  
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When I first took my Grape Gascans out of the microbag, I thought I had gotten black instead of grape, that is, until I held them up to the light. They go from looking crystal black to looking a very nice purple.
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Like Dann said, it's a very subtle purple but if you see it in good lighting, it really jumps out at you and looks great when it does.
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Nice Cystal Purple color, that looks black when wearing, but shines when sitting around in your collection. Definitely needs a lot of backlight to show its true beauty.