DiotimosReading Desk

Burnt copper

aes ustum; aeris; aes; cuprum; cupri; ♀; Aes ustum

Burnt copper is listed beside vitriol and verdigris and is explicitly called crocus of copper in its own paragraph.

From the book

Nine Books on the Nature of Things

Attributed to Paracelsus · Diotimos Editions · 2026

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Meaning

Burnt copper is listed beside vitriol and verdigris and is explicitly called crocus of copper in its own paragraph. The planetary Venus sign also names copper. The word aes explains the aeris in verdigris, which must not be confused with air. Although the preparations share a metal relation, the edition keeps them distinct rather than translating the opening list as a single compound name.

Places to read

  1. Book 5 · Death · Passage 11Latin“aes ustum fiat, quod & crocus cupri appellatur”