The potion is a phosphorescent emerald liquid, designed to prevent the drinker from finishing it. It is used in the stone basin that conceals one of Lord Voldemort's Horcruxes.

From the Story

Harry Potter and the Half-Blood Prince

Discovered in chapter 26, The Cave

The potion is protected with an invisible barrier which makes it impenetrable to a human hand. Professor Dumbledore drinks the potion from a crystal goblet - halfway through the gobletful, the potion causes him to appear as though he is deeply asleep, dreaming a horrible dream. The potion causes Dumbledore to plead to stop drinking, becoming weaker and acting as though he is being attacked by invisible torturers.

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