Visit the Minecraft Wiki for basic information about Potion of Night Vision

The Potion of Night Vision is a vanilla item brewed with an Awkward Potion and a Golden Carrot or with an Antennae and a Shining Potion from Project Zulu.

The Potion of Night Vision allows players to see with perfect visibility in the dark and improved visibility underwater.
Vanilla - Night Vision - Underwater

The potion's effect underwater.

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