Moreover, in those days, lead was used exclusively for ruling and in no way for writing or drawing; it was employed in the form of round, sharp-edged discs, similar to those which, it is said, were already used for the same purpose in ancient classic times.
— from Forty Centuries of Ink Or, A chronological narrative concerning ink and its backgrounds, introducing incidental observations and deductions, parallels of time and color phenomena, bibliography, chemistry, poetical effusions, citations, anecdotes and curiosa together with some evidence respecting the evanescent character of most inks of to-day and an epitome of chemico-legal ink. by David Nunes Carvalho
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