Alchemical in the context of "Philosophers' stone"

The ouroboros (/ˌʊərəˈbɒrəs/) or uroboros (/ˌjʊərəˈbɒrəs/) is an ancient symbol depicting a snake or dragon eating its own tail. The ouroboros entered Western tradition via ancient Egyptian iconography and the Greek magical tradition. It was adopted as a symbol in Gnosticism and Hermeticism and, most notably, in alchemy. Some snakes, such as rat snakes, have been known to consume themselves.

Processing (simplified Chinese: 炮制; traditional Chinese: 炮製; pinyin: páozhì, or Chinese: 炮炙; pinyin: páozhì) in Chinese materia medica (Chinese herbology) is the technique of altering the properties, sterilizing and removing poisons of crude medicines by processing using heat and combination with various materials in a kind of alchemical approach to preparation. It lacks scientific evidence and hence is considered as pseudoscientific.

Zosimos of Panopolis (Greek: Ζώσιμος ὁ Πανοπολίτης; also known by the Latin name Zosimus Alchemista, i.e. "Zosimus the Alchemist") was an alchemist and Gnostic mystic. He was born in Panopolis (present day Akhmim, in the south of Roman Egypt), and likely flourished ca. 300 AD. He wrote the oldest known books on alchemy, which he called "Cheirokmeta," using the Greek word for "things made by hand." Pieces of this work survive in the original Greek language and in translations into Syriac or Arabic. He is one of about 40 authors represented in a compendium of alchemical writings that was probably put together in Constantinople in the 7th or 8th century AD, copies of which exist in manuscripts in Venice and Paris. His fellow Egyptian alchemist Stephen of Alexandria is another.

Arabic translations of texts by Zosimos were discovered in 1995 in a copy of the book Keys of Mercy and Secrets of Wisdom by Ibn Al-Hassan Ibn Ali Al-Tughra'i', a Persian alchemist. The translations were incomplete and seemingly non-verbatim. The famous index of Arabic books, Kitab al-Fihrist by Ibn Al-Nadim, mentions earlier translations of four books by Zosimos, but due to inconsistency in transliteration, these texts were attributed to names "Thosimos", "Dosimos" and "Rimos"; also it is possible that two of them are translations of the same book.Fuat Sezgin, a historian of Islamic science, found 15 manuscripts of Zosimos in six libraries, at Tehran, Cairo, Istanbul, Gotha, Dublin and Rampur. Michèle Mertens analyzed what is known about those manuscripts in her translation of Zosimos, concluding that the Arabic tradition seems extremely rich and promising, and regretting the difficulty of access to these materials until translated editions are available.