Plumbago

Definition and stakes

Johann Beckmann,  A History of Inventions, Discoveries…

“ The greater part of the plumbago at present used in commerce, but which, as far as I know, is fit only for iron-black, comes from Spain, where it is dug up in the neighbourhood of Ronda, a town in Grenada, a few miles distant from the sea; but, in regard to the antiquity of these pits, I have found no information. In commerce, it is called potloth; and the mills, such as those at Bremen, where it is ground fine, are named potloth mills, an appellation which in all probability has been borrowed from the Dutch, among whom potloot signifies as much as potters’ lead. ”
Source: Gutenberg

Portrait of Antoine Lavoisier Antoine Lavoisier,  Elements of Chemistry (1790)

“ Combustible substances, which in acids and metallic oxyds are a specific and particular principle, are capable of becoming, in their turn, common principles of a great number of substances. The sulphurous combinations have been long the only known ones in this kind. Now, however, we know, from the experiments of Messrs Vandermonde, Monge, and Berthollet, that charcoal may be combined with iron, and perhaps with several other metals; and that, from this combination, according to the proportions, may be produced steel, plumbago, &c. ”
Source: Wikisource

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