[956] Linnæi Amœnitat. Academ. vii. p. 452.
[957] Gmelin’s Reise durch Sibirien. Gött. 1752, 8vo, iii. p. 55.
BLACK LEAD.
To ascertain how old the use of black lead is for writing might be of some importance in diplomatics, as the antiquity of manuscripts ruled or written with this substance, or of drawings made with it, could then be determined.
I allude here to pencils formed of that mineral called, in common, plumbago and molybdæna, though a distinction is now made between these names by mineralogists. The mineral used for black-lead pencils they call reissbley, plumbago, or graphites; but under the term wasserbley and molybdæna they understand a mineral once considered to be the same as the former, but which, however like it may be in appearance, differs from it in being heavier, occurring much seldomer, and containing a new metal, almost of a steel-grey colour, exceedingly brittle, and named molybdænum. Plumbago, which is the substance here meant, when exposed to an open fire, is almost entirely consumed, leaving nothing but a little iron and siliceous earth. It contains no lead; and the names reissbley and bleystift have no other foundation than the lead-coloured traces which it leaves upon paper. The darker, finer, and cleaner the lines it makes are, the fitter it is for drawing and writing. These lines are durable, and do not readily fade; but when one chooses, they may be readily rubbed out. Black lead, therefore, can be used with more convenience and speed than any coloured earth, charcoal, or even ink.
It is well known that transcribers, more than a thousand years ago, when they wished their writing to be in a particular manner beautiful and regular, drew fine parallel lines, which they followed in writing. These lines may be still clearly distinguished in old manuscripts. In many instances, they have only been impressed on the parchment by some hard, sharp body; but they often exhibit a leaden colour; from which one might suppose that they had been drawn with our plumbago, and consequently believe that the use of this substance is as old as we must consider, from certain marks, the oldest ruled manuscripts. But, on a little reflection, one will be convinced that this would be a very fallacious conclusion. For lines so like those made with plumbago, that the eye can scarcely perceive the difference, may be made with lead[958].
It can be proved that the ancients drew their lines with lead; and this could be done with more convenience, as this soft metal was easily rubbed off by the parchment, which, being harder and rougher than our paper, had therefore more body. It is well known that, formerly, when people wished to draw lines, a small round plate of lead, which could not so readily cut the parchment or become bent as a leaden style, was employed[959].
Old manuscripts, ruled with lead-coloured lines, have been pointed out by modern diplomatists. Our learned Professor Schönemann, who was unfortunately hurried off by a premature death, has given a description of the Codex Berengaris Turonensis, of the eleventh or twelfth century, and the Codex Theophyli Presbyteri de Temperamento Colorum of the latter century, both preserved in the library of Wolfenbuttel; and remarks that lines are drawn on the first partly with a style and partly in a light manner with lead; but he says of the other, that it exhibits very fine lines drawn with a black-lead pencil[960]. Le Moine quotes a document of the year 1387, which is ruled with black lead, and at the same time says that the custom of ruling ceased about the year 1421 and 1424. The lines, therefore, after that period, became crooked and oblique[961].
But the antiquity of black-lead pencils cannot be determined by the help of diplomatic documents. It might be traced out with more ease were it known by what mineralogical writer plumbago, and the uses of it, were first mentioned. The following is what I have remarked on this subject; but I suspect that there must be some older mention of it than any I have yet been able to find. I do not, however, believe that those who require more than bare conjecture will discover this mineral in the works of the Greeks and the Romans; for it cannot possibly be proved that it is to be understood under the terms plumbago, galena, molybdæna, and molybdoides, as has been confidently asserted by many, who, were it not superfluous, might easily be refuted. But in whatever obscurity these names may be involved, one can with certainty discover that they sometimes denote galena, or a real lead ore, or else some production of lead works.