Scroll, common
This book Titled "alchemy for village idiots" contains recipes, notes and instructions on brewing elixers, potions and how to avoid making a poison and detailed points around how poisoned are produced to help you not make them as to follow com men law practice.
With this book you have advantage on (wisdom) perception rolls to identify potions and posions.
Additionally, with this book you have advantage on using alchemy tools.
(Player can talk to dm about what recipes they can add to their notes for alchemy)
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