The green Paint Bomb debuff is similar to that of the Animal Blood debuff, in that it can only be removed by submerging your character in water.

On use, your character will hurl a tiny bottle at an enemy player, which is followed up by the sound of breaking glass. One small bummer about the Paint Bomb is that there is a short cast time, and they cannot be used while moving. Not a huge deal, but it does make it harder to douse your enemies with these things as you charge across the battlefield.