In the age of computers and digital today, pencils and erasers are almost forgotten. But their use is still widespread today. Having a pencil and eraser in your compass box also requires a rubber eraser to remove pencil stains or text from the paper, especially when drawing. Do you know how rubbing rubber removes pencil stains?
The invention of the pencil is very old but today the pencil is made of graphite and clay. Written on paper. It is a layer of fine particles of graphite. Stain remover erasers are made of polyvinyl chloride or synthetic rubber. This is a petroleum product. The pencil text on the paper is graphite particles interspersed with paper fibers. The fibers of the paper hold the graphite particles tightly. But synthetic rubber fibers are more powerful than that. It attracts graphite particles to itself and sticks with the rubber.
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