Invisible inkSource Ultimate Equipment pg. 103, Adventurer's Armory pg. 19
Price  10 gp (average), 25 gp (good), 2 gp (simple), 75 gp (superior); Weight — (average), — (good), — (simple), — (superior)DescriptionInvisible ink is a staple of spies, rebels, and secret societies everywhere. Messages written with invisible ink only become visible under specific circumstances. Revealing the secret message with the proper triggering agent is a full-round action per page of text. A successful Craft (alchemy) check reveals the message without the proper trigger and takes 1 hour (the DC varies by ink quality).
Simple: This ink is keyed to a single, fairly common trigger, such as heat or vinegar (DC 20 to reveal without the trigger).
Average: This ink is keyed to either two common triggers or one uncommon trigger, such as blood or acid (DC 25 to reveal without the trigger).
Good: This ink is keyed to either two uncommon triggers or one rare trigger, such as a specific vintage of wine or a specific kind of monster’s blood (DC 30 to reveal without the trigger).
Superior: This ink is keyed to either two rare triggers or one unique trigger, such as the blood of a specific person (DC 35 to reveal without the trigger).ConstructionCraft (Alchemy) DC 25
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