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seen Oct 5 '12 at 19:01

Oct
5
revised xcolor black isn't black enough
added a color-profile tag, which seems apropos given the solution
Oct
2
revised Using etoolbox macros in tikz foreach loops
Applied comments. Thanks all!
Oct
2
revised Using etoolbox macros in tikz foreach loops
Pasting the given code in its entirety, and running pdflatex, should now reproduce the problem.