From Helen South,
Your Guide to Drawing / Sketching.
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Try doing a seven-step grayscale. A B or 2B pencil should give you the full seven steps, though you may need to manipulate it a little to get the very lightest tones, erasing lightly and reworking. For a really effective grayscale, use harder and softer pencils to get the lighter and darker shades, overlaying differing grades to get the transitional tones. Try printing out a computer grayscale to use as a reference.