Hound’s Blood

Source Advanced Race Guide

If you apply the thick, red paste known as hound’s blood to your nostrils or upper lip, it greatly enhances your sense of smell. For most creatures, this grants a +2 circumstance bonus on Perception checks for 1 hour. For Gnomes, it briefly grants a super-heightened sense of smell, granting the Scent ability for 5 minutes, before the potency is reduced to a +2 circumstance bonus on Perception checks for an additional 1 hour.