A formula book has 100 pages of parchment, and each alchemical extract formula takes up one page per extract level. A newly purchased formula book contains no extract formulas. An alchemist character begins play with a formula book containing the extract formulae he knows (Advanced Player's Guide 32). This is the alchemist equivalent of a spellbook for wizards (a spellbook and a formula book are essentially the same item).
- Ultimate Equipment
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