Graphite pencil

Definition and stakes

Various,  Popular Science Monthly (1893)

“ Pens, crayons, and red chalk held the place among artists and in general use now occupied by the pencil. The famous graphite beds of Borrowdale, in Cumberland, were discovered during the reign of Queen Elizabeth in England, and with them the material which was destined to stimulate the rapid development of the pencil industry. Our lead-pencil is really a graphite pencil. ”
Source: Wikisource

Eva March Tappan,  Makers of Many Things

“ When graphite was first used for pencils, it was cut into slabs and these slabs into small strips. The broken and powdered graphite was not used until it was discovered that it could be mixed with clay and so [52] made into sticks. In a lead pencil there are only three substances, graphite, clay, and wood, but a really good one must be manufactured with as much care as if it were made up of twenty. First of all, the graphite is ground and ground and ground, until, if you take a pinch of it between your thumb and finger, you can hardly feel that anything is there. ”
Source: Gutenberg

C. Ainsworth Mitchell,  Science and the Criminal

“ In the case of inks that do not contain iron, or when the writing was in carbon or aniline typing ink, this method of incineration will prove unsuccessful.
Writing that has been done with an ordinary lead pencil can usually be rendered visible by carefully regulating the heat during the incineration, so as not to burn away the graphite. Marks done with a red pencil are, as a rule, burned away with the paper, but blue pencil marks usually persist owing to the presence of an iron compound in the pigment.
”
Source: Gutenberg

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