Nigredo

Nigredo, the blackening, is the first of the colour-stages through which the alchemical Great Work (magnum opus) was said to pass. It names the first stage, in which the matter is broken down, putrefied and reduced to a black, formless mass.

The colour-stages of the Work

Symbolically Nigredo marked the death and dissolution of the old form, and, in the inner reading, the confronting of one's own darkness. The classic sequence, nigredo, albedo, citrinitas, rubedo, describes the transformation of base matter into the perfected end of the Work through a succession of colours seen in the vessel.

The earliest named source for a colour-stage sequence in matter is the Greco-Egyptian alchemist Zosimos of Panopolis, writing around the turn of the fourth century CE, whose visionary treatises describe a figure dismembered, blackened and boiled as an image of the material transformation he was pursuing; Latin alchemical writers of the fourteenth to seventeenth centuries, working in a tradition descended from that Greco-Egyptian material by way of Arabic translation, then elaborated the sequence into the fuller four-stage form generally cited today. The stages carried at once a chemical and a spiritual meaning, and were read by the depth psychologist C. G. Jung, in his 1944 study Psychologie und Alchemie, as an allegory of inner transformation, the nigredo in particular corresponding to what he called the encounter with the shadow. The stage is described here within that documented tradition of European alchemy and its later interpretation.

Sources The Secrets of AlchemyLawrence M. Principe with Psychology and AlchemyC.G. Jung

The colour sequence of the Great Work is older than its Latin names, and tracing it back changes what the stages look like.

The Greek names

The Graeco-Egyptian alchemical writings, the earliest substantial body of alchemical text that survives, describe the work as a progression of colours: melanosis, the blackening, then leukosis, xanthosis and iosis. Nigredo is the Latin translation of the first of these, and the Latin sequence that this atlas records is a rendering of the Greek one.

What the blackening was on the bench

In the Greek material the colours are colours of a metal or an alloy being worked, and blackening is what a prepared metal surface does under certain treatments. The stages describe an observable sequence in a vessel before they describe anything else. Later writers read the sequence spiritually and later writers still read it psychologically, and each of those readings is real, but the observational layer is the oldest.

Why the first stage carries the weight it does

Of the four, the blackening has attracted by far the most commentary, in alchemy itself and in every later system that borrowed the scheme. A sequence whose first step is dissolution and decay is unusual among models of improvement, and that is very largely why the vocabulary has travelled so far outside alchemy.