I never knew that a collection of Greek alchemical texts existed with French translation in four volumes, but it does: Edition: M. Berthelot/Ch. Em. Ruelle, Collection des anciens alchimistes grecs , Paris 1887-1888. Better still, much of it is online.
- Volume 1 (Archive.org)
- Volume 2-3 (Archive.org). Vol. 2 is Zosimos; p.244 of the PDF is the start of vol. 3, old authors and technical texts and commentators.
- Volume 3-4 (Google books). Volume 4 seems to be indexes.
The packaging of these volumes in PDF’s is unfortunate. Nor do I see various texts of the Byzantine period, such as Stephanos of Alexandria. But … still worth knowing about.