Leech Gap

While in his transformed state, Utakata can ooze an extremely alkaline liquid, which burns upon contact. Killer B while in his full Eight-Tails form commented that the substance was strong enough to burn through his skin. In the anime, when he used this technique in his Version 2 form, Utakata's chakra cloak turned blue.

Trivia

 * According to the Fourth Databook, Saiken is a user of this technique.