Extreme caution with this potion, as inhaling the fumes will cause temporary blindness, and drinking it will cause permanent blindness. This is the cheapest potion in this book, as most of the ingredients are fairly common. This potion has only had two uses I could think of. Throwing it on the ground as an escape attempt, as the fumes cause blindness, or putting it in a air-tight safe, so if someone tries to steal from it, they'll go blind. Wear a protective mask so as to not breathe in the fumes while brewing, which can be deadly when it is not finished.

Ingredients:
One large living Mandrake
Two liters of water
Long string from a cloak of invisibility
One Basilisk eye
Five strands of Thestral bone marrow

Instructions:
1. Boil the water and put in the hair and string.
2. Dice the mandrake. In its mouth, put in the Basilisk eye (Not sure if it still works, look away just in case)
3. Mix in the mandrake until it dissolves.
4. Take off the heat and let it sit for four days somewhere dark.
5. Bottle it and store it somewhere cold and dark

The fumes' effect last around three hours, and cause the affected's eyes to go pitch black.