Alchemy Theory

[BessAgritianin]

Be careful with the extremely widespread pseudoepigraphy in alchemy: many anonymous books were wrongly attributed to some authority of the past.

Yes- pseudoepigraphy was wide spread in alchemy. Many anonimous works were falsely attributed to Albertus Magnus, Thomas Aquinas etc.
We must destinguish between works that were pseudoepigraphic and those that were not:

Alberus Magnus- was a Dominican friar and bishop, who wrote authentically on minerals, metals and their transromation. 

Roger Bacon-a Franciscan friar-in Opus Majus dicussed alchemy, the Philosopher stone and the transmutation of metals. 

There are other examples , but I do not want this valid information to distract us from  the main question of this thread- the Alchemy in the Voynich Manuscript.