Comparing Views on Lead and ‘Black Lead’: Graeco-Egyptian Alchemy and the Wider Hellenistic and Roman World

As conceptualised in Greco-Egyptian alchemy, “black lead” – and at times mercury – has been interpreted in influential modern accounts as a kind of prime matter conceived through Platonic or Aristotelian notions. Additionally, Cristina Viano has read a passage in the alchemical work attributed to Olympiodorus as alluding to the distinction in Timaeus 67e between white as distinguishing (διακριτικόν) and black as comprehending (συνεκτικόν). In this passage, Zosimus is quoted in a discussion of “black lead”, “residues”, and the contrast between blackening and whitening. Whatever one makes of this supposed philosophical background, a substance called “our black lead” also occupies a practical place in a recipe attributed to Pseudo-Democritus and quoted in Zosimus, with added glosses. The identification of this material and its function is not straightforward: in the Pseudo-Democritean context, it seems to refer to a composite of stibnite and litharge used in processing pyrite to produce a colouring substance; in the work attributed to Olympiodorus, it is less clearly associated with “residues” or “ashes”, and closely connected with the process of blackening and whitening. Given these ambiguities, and the interpretative links that have been proposed to Platonic and Aristotelian thought, it is worth considering how such conceptions relate to broader Greek and Roman views of lead itself. In this presentation, I will offer a preliminary comparison between the alchemical passages and attested non-alchemical discussions of lead’s colour – black or grey – and its properties, such as coldness and density. The comparison will draw on philosophical works (e.g., Plutarch), medical writings (e.g., Dioscorides), and encyclopaedic accounts (Pliny), as well as miscellaneous evidence (e.g., inscriptions of defixiones). The aim is to provide an initial orientation for assessing whether the prominence of “black lead” in alchemy reflects traditional Greco-Roman assumptions or arose independently within alchemical practice.