Tomes of Alchemy is a fantasy supplement that describes in detail 20 different books that players could find on bookshelves and in libraries, broadly on the subject of alchemy.
Each book has its name and author, a description of the book and contents, including appearance, size, weight and estimated value, and notes that have Pathfinder effects for the books.
Topics covered include poisons, ingredients, potions, plants, charlatanry, alchemical metallurgy and some more philosophical works.
These books could be used by players to build their own library, help enhance their knowledge, or simply be valuable pieces of treasure.
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Some sample titles are:
Imrauhil's Guide to Better Potion Making by Imrauhil
The Alchemical Primer by Carac Vonneyn
Alchemical Glassware - Its Manufacture, Uses and Maintenance by Celid Jelash
One page is the front cover, one the front matter, one page is ads and one page is the Open Game License.
This supplement is also available in a system neutral version. The latter is a bit shorter and doesn't have the Pathfinder stats for some items. You do not need to buy both versions.