Alchemy is a complex subject with many aspects. Perhaps it is best known as the quest for the philosopher/s Stone to change base metasl into gold.  But theer is much more to alchemmy than just this one aspect. There are hundreds of genuine alchemical texts, some of which are allegorical literature with beautiful and mysterious symbolism, while others provide us with insights into the very nature of matter.  
Adam McLean, a well known authority on alchemical texts and symbolism, has organized a powerful website containing  over 150 megabytes online of information on alchemy in all its facets. Providing tens of thousands of pages of text, over 2500 images, over 240 complete alchemical texts, extensive bibliographical   material on the printed books and  manuscripts, numerous articles, introductory and general reference material on alchemy.