When marking up on resistant or dark surfaces, i.e. glass, laminates, dark veneers it might help to cut up address labels and first stick these across the intended lines maybe at 1ft intervals. The marks can then be made on, and the line drawn across, the labels.
Address labels were chosen, both because they were at hand and because they're particularly receptive to fine pencil lines and similar. Unlike say, masking tape.
michael adams
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