"Alchemy is based on the Square of the Four Elements. The Four Elements are oppositions. The oppositions of Alchemy are related to the oppositions of the Square of Opposition of Aristotle in an orthogonal model. They form an arc of 90 degrees, which makes Alchemy the complex part (imaginary) of Logic. In his work De Arte Combinatoria Leibniz developed a general theory of science that was based on a fusion between Alchemy and Logic."

http://hans.wyrdweb.eu/about-alchemy-and...oppositio/

Ancient recipes investigated, e.g. "formulations from a sixteenth-century alchemical treatise, the "Nectar Mine Light of Mercury" (Rasaprakāśasudhākara). The treatise focusses on the medicinal application of mercurials, but also contains a chapter on making alchemical gold and silver and artificial pearls and coral."

http://ayuryog.org/content/alchemy-reconstruction

e.g. The Hermetic Marriage of Art & Alchemy: Imagination, Creativity, and the Great Work (Inner Traditions, 2023)

https://marlenesevenbremner.com/

   

"Alembic Rare Books specialises in rare science books, including first editions, signed copies, manuscripts, and ephemera, as well as original scientific instruments."

https://alembicrarebooks.com/pages/about-us

"Harry Potter is full of rich alchemical symbolism. For example the stone mentioned in the title of Part 1, The Philosopher's Stone is a very ancient alchemical symbol. Nicholas Flamel was a real person living in France in the 14th century, and is said to have made the Philosopher's Stone. The name of another historical alchemist, John Dee, is hidden in the text of Part 5 (Hagrid goes to Dee John = Dijon in France). But one of the greatest indications that Harry Potter is an alchemical story is its similarities to a book published in 1616: The Chymical Wedding of Christian Rosycross."


http://www.harrypotterforseekers.com/alc...lchemy.php

A general introductory website riddled with ads:

https://www.alchemylab.com/

https://www.youtube.com/watch?v=UUaGfzgjRok

With transcription.

https://www.youtube.com/watch?v=oTxebninNPU&t=0s

With transcription.

Ellic Howe’s book on Ayton.

https://archive.org/details/ellic-howe-t...olden-dawn

Plus interesting collections.

https://archive.org/details/astral-proje...o/mode/2up