Roald Dahl used only pencils with yellow casing to write his books. He had 6 sharpened pencils

The majority of pencils made in the US are painted yellow.[44] According to Henry Petroski,[45] this tradition began in 1890 when the L. & C. Hardtmuth Company of Austria-Hungary introduced their Koh-I-Noor brand, named after the famous diamond. It was intended to be the world's best and most expensive pencil, and at a time when most pencils were...

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