Joseph Dixon introduced the yellow No. 2 Ticonderoga pencil In 1913. It was originally manufactured with brass ferrule, but it was temporarily changed to green plastic due to a metal shortage during World War II. The now-iconic color scheme continued after the war on a metal ferrule. The Czech company, Koh-i-Noor Hartdmuth, is credited with starting the yellow colored pencil trend at the World’s Fair in 1889 by painting its pencils. They patented the first pencil lead made from a combination of kaolin and graphite, a technique that allowed for the hardness of the graphite to be varied. Pencil makers everywhere were able to classify a pencil's graphite core. The US uses a number system while the EU uses a lettering system where HB equals a No. 2.
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