I'm using the Xfce 4.10 desktop environment on Ubuntu 12.04. While trying to get things the way I want I came across #aaaaaaaaaaaa and #666666666666 in
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Looking elsewhere, for example, I see more complex codes like the ones in bold below:
! Active border colors
I know about the 6-character hex code and the RGB code from here but I hope someone here can explain the basis of these twelve-character color codes or point me to some easy reading on it?