graining patches

Graning/Shading patches - The traditional method is pigment and dyes to simulated the grain and shading. I was wondering if anyone has had any experience with the pencils or markers (suck as mohawk's graining pencils/shading pencils or graining markers)? If they do work I would imagine they could be much simpler as long as they have the right shades.
Opinions? Experiences? Mike
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