Degrees of graphite pencil hardness. 9H is the hardest while 9B is the softest : r/coolguides
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Przemysław Pawełczyk on X: "#Mohs #hardness scale vs #graphite #pencil hardness Wolff-Wilborn scale. 9H protections typically refer to the latter, meaning they're often inferior to what you want to protect, like Gorilla
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Graphite Pencil Degrees of Hardness Explained – Faber-Castell USA
