Separation

Separation is counted the third of the seven operations into which the alchemical Great Work is often divided. In the laboratory it named the drawing-apart of the dissolved matter into its components.

Operation and its meaning

Read symbolically, as the alchemists read their own work, Separation stood for the sifting of the valuable from the worthless, the conscious choosing of what to keep and what to discard. In the scheme of correspondences that links the operations to the seven classical planets, it is attributed to Mars.

The alchemists worked at once with real chemical processes and with a language of spiritual transformation, so that a single term carried both a bench meaning and an inner one. The operation is described here within that documented tradition of European alchemy, whose sources run from the Hellenistic and Arabic writers through the Latin Middle Ages and the early modern laboratory.

Separation is the most straightforwardly technical of the operations, and the one whose laboratory sense survives most obviously into modern practice.

What the word describes

Separatio means dividing a mixture into its components: decanting a liquid off a residue, filtering, skimming an oily layer, drawing off what rises from what settles. Every one of those is still done, under other names, in any working laboratory.

In the alchemical texts the operation carries the further sense of dividing the pure from the impure, and the two senses are not separable in the sources themselves. An operator who filtered a liquor and an operator who spoke of separating the subtle from the gross were often the same person doing the same thing and describing it in two registers.

Where the number seven comes from

A fixed run of seven numbered operations mapped onto the seven planets is a modern tidying. The historical sources give varying counts: Ripley's fifteenth-century Compound of Alchymy has twelve gates, and other treatises list other operations in other orders. The seven-step version now in general circulation is a synthesis rather than a transmission, and the atlas records it as the common modern scheme while saying so.

That distinction matters when reading a primary text, because a reader expecting seven ordered stages will not find them.