
Historically, pencil makers have used graphite grading scales like 2H or 2B to indicate the hardness and darkness of the core. Although there is a certain charm to these letters, for some it poses questions when selecting pencils. And because they typically come unsharpened when first purchased, there’s no way of testing them. So Japanese designer Kazuya Ishikawa came up with a simple way of visualizing what type of graphite is in each pencil.
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