When you cast this spell, you mix special tattoo inks into a potion of your choice. Once you finish casting tattoo potion , the potion begins bubbling and fizzing—if no one drinks the potion within 1 minute of the spell being cast, the potion bubbles away into vapor and is destroyed.
When a potion under the effects of tattoo potion is imbibed, the effects of the potion do not occur. Instead, the potion transforms into a spell tattoo on the drinker’s chest tattoo slot—if the drinker already has a magic tattoo in this location, the tattoo potion is wasted. Once the potion transforms into a tattoo spell, it remains in place permanently until it is used as a spell tattoo.
Pathfinder Campaign Setting: Inner Sea Magic. © 2011, Paizo Publishing, LLC; Authors: Jesse Benner, Jason Nelson, Sean K Reynolds, Owen K.C. Stephens, Russ Taylor.