It has been a fact that in the last few years there has been an increasing interest for the science of alchemy. Nowadays, many books are published in which the Hermetic Art is only approached in its occult and philosophical aspect. Therefore, whoever reads those books, will have a wrong idea about what is the true traditional alchemy.

They are very rare the books about the Art of Hermes in that the authors, classic or contemporary, describes the respective works operatively and, when they do it, it is almost always in figured language.   

Rubellus Petrinus, portuguese alchemist, describes and explains in this book the classic works of three well-known great alchemists, “Eirenaeus Philalethes, Nicholas Flamel and Basil Valentine”, to demonstrate to the sceptics, that the alchemy is something positive and more than the said  "philosophical-alchemic"speculation that some modern authors frequently refer to in their books.   

Given his personal experience of more than thirty years of study and practice of the alchemy, the author explains the texts in details, practically in clear language and, as well as the “modus operandi”.   

It is of our knowledge that, no modern alchemist have dared to go so far in the explanation of the works of these Great Masters, having, some times, surpassed the limit imposed by the tradition.