The first author in whose writings I have as yet found certain mention of plumbago is Conrad Gesner, whose name I can never pronounce without respect. In his book on fossils, printed at Zurich in 1565, he says that people had pencils for writing which consisted of a wooden handle, with a piece of lead, or, as he believed, an artificial mixture, called by some stimmi Anglicanum. Such pencils must at that time have been scarce, because he has given a figure of them in a wood-cut. To judge by this, the pencil seems to have had a wooden sheath or covering.
Thirty years after, Cæsalpinus gave a more complete account of this mineral, which he calls molybdoides, because he thinks it was so named by Dioscorides. He says that it was a lead-coloured shining stone, as smooth as if rubbed over with oil; it gave to the fingers an ash-grey tint, with a plumbeous lustre, and pointed pencils were made of it for the use of painters and draftsmen. He adds, that it was called Flanders’ stone, because it was brought from the Netherlands to Italy[962].
Three years after Cæsalpinus, a still better description was given by Imperato. The latter calls the black lead grafio piombino, and says that it is much more convenient for drawing than pen and ink, because the marks made with it appear not only on a white ground, but, in consequence of their brightness, show themselves also on black; because they can be preserved or rubbed out at pleasure; and because one can retrace them with a pen, which drawings made with lead or charcoal will not admit[963]. This mineral is smooth; appears greasy to the touch, and has a leaden colour, which it communicates with a sort of metallic lustre. It can resist for a long time the strongest fire; it even acquires in it more hardness, and therefore has been considered as a kind of talc. Sometimes it is foliaceous, and may be crumbled to pieces in scales; but it is frequently found denser and stronger, and in this case writing-pencils are made of it. The first kind was mixed with that clay called rubrica, and manufactured into crucibles, which were exceedingly durable in the fire. It is here seen that these Italians, at that time, were well acquainted with this mineral. It has been reckoned a species of talc by Justi, by Wallerius in the first edition of his mineralogy, and also by others. Its durability in resisting heat is certainly manifested, when it is kept in a close fire and between coals. But it is proved by the experiments of modern mineralogists, that in an open, strong, and long-continued fire, it becomes almost entirely consumed.
Bartholomew Ambrosinus, in the continuation of Aldrovandi’s Musæum Metallicum, printed at Bologna in 1648, uses the name lapis plumbarius. The short account which he gives of it has been borrowed from the two Italians last mentioned; but it deserves to be remarked, that even then he thought it worth his while to give Gesner’s figure enlarged.
In the works of Albertus Magnus, George Agricola, Encelius, Cæsius, Kircher, and many other old mineralogists, I have found no mention of black lead. But as the advantageous use of it for crucibles was known to Imperato, and as the crucibles made at Ips, which till very lately were employed by all the mints in Europe, and even in other parts, derived their superiority from plumbago being mixed with the blue clay, and as these crucibles are introduced more than once by Agricola without any mention of the addition, it must either at that time have not been usual, or it must have escaped the notice of this diligent man. How old then are the pits at Leizersdorf, which furnish plumbago for the crucibles of Ips or Passau? I know of one mineralogist only who has described that district, but on this subject he has given us no information.
I am equally unacquainted with the time when the pits in Cumberland, which, as is well known, produce the best plumbago, were discovered. They are situated on the Borrowdale mountains, about ten miles from the town of Keswick. The families to whom these pits belong, according to an established regulation, can open them only once every seven years, and take out but a certain quantity of the mineral, in order to keep up the price, and prevent the pits from being exhausted[964]. This production is called there black lead, kellow or killow, wad or wadt, which words properly mean black[965]. I have found no older information in regard to these pits than that of Merret, who wrote in the year 1667, and who calls this mineral nigrica fabrilis, because it had then no Latin name[966]. Pettus remarked, in his Fleta Minor, published 1683, that the pencils made from it were inclosed in fir or cedar. It is related by Robinson[967] and others, that at first the country-people around Keswick marked their sheep with it. Afterwards the art was discovered of employing it for earthenware, and for preserving iron from rust. The last-mentioned author says also, that it is used by the Dutch in dyeing, in order to render black more durable, and that it is bought up by them in large quantities for that purpose. But this is only a pretence. I am inclined to think that they prepare from it black-lead pencils.
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. From this word the French have made potelot, which however in many dictionaries is omitted. If I am not mistaken, this mineral was first found in France at a very late period in Upper Provence, near Curban, and not far from the river Durance, between Sisteron and Gap, from which it is sent to Marseilles.
It appears to me probable, that in the sixteenth century the use of plumbago was first introduced into Italy, a country which abounds with draftsmen and drawing-schools; where other minerals had been long used for drawing, and where the best kinds had been carefully sought out. It is likely, therefore, that some one may have made a trial with plumbago, induced by its appearance; and indeed nothing but a trial was necessary to show its superiority to charcoal, and to black and red chalk. I am inclined to think also, that the earliest mention of it will be found in the oldest Italian works on drawing, rather than in those on mineralogy, to the authors of which this substance first became known by its use. For a long time, all the black-lead pencils employed in Germany and in the neighbouring countries were made at Nuremberg. I shall here observe, that the very convenient method of wiping out writing made with a black-lead pencil, by means of Indian rubber, was discovered about twenty or thirty years ago, and, as I believe, first in England.
After I had completed this article, Professor Fiorillo, who as an artist has studied the master-pieces, and as a man of letters the writings of the Italians, communicated to me, at my request, the following information, which at any rate will form an additional fragment towards the history of drawing. The pencils first used in Italy for drawing were composed of a mixture of lead and tin fused together, and the proportion was two parts of the former and one of the latter[968]. To obliterate a drawing or piece of writing, it was rubbed over with crumbs of bread. A pencil of this kind was called stile. Petrarch has immortalized a painter named Simone Memmi by a couple of sonnets, out of gratitude for a picture of his beloved Laura[969]. In these he says that the artist made the drawing with a stile in carte. The author here evidently alludes to a drawing-pencil, and not to a graver, as some have supposed. Boccacio, a scholar of Petrarch, celebrates an artist who was equally expert at drawing with the stile, the pen, and the pencil. Michael Angelo also, who died in 1564, says, in a sonnet on Vasari, quoted by Fiorillo, “Se con lo stile e co’ colori avete.” Such pencils were long used also in Germany; and formerly they were found at the most common writing-desks.
The use of red and black chalk seems to be more modern. The former is called by the Italians matita rossa, and the latter matita nera. This name is derived from hæmatites. Vasari celebrates Baccio Bondinelli, who died in the middle of the sixteenth century, because he could handle equally well lo stile, e la penna, e la matita rossa e nera. Baldinucci says, that the best red chalk comes from Germany; good black chalk from France; but the very best from Spain, whence that of the first quality is obtained at present.