Architect's Pencil

Konrad Eek's pencil

I've been watching an enjoyable course on Lynda.com about matting and framing. As the instructor, Konrad Eek, is marking his matte board for the initial cuts, he pauses for a moment to tell us that we should be using a 6H "architect's pencil," because it has a "hard lead...that leaves very little graphite residue." That's all the excuse I need to get a new pencil, although I would probably go for a Unigraph or Kimberly over that Turquoise.