Board Thread:Fourth Databook/@comment-4366149-20141122004623/@comment-25626003-20141203003139

Well, yeah. You just said it. Chap. 464 confirmed Amaterasu and Kagutsuchi to be both Blaze Release, and both are dojutsu. Sasuke is the only one with Kagutsuchi and Amaterasu (Blaze Release standing alone). Itachi just has Amaterasu and that too, is a visual jutsu. Unlike the other chakra natures, these two don't require hand seals. Sasuke unleashes the flame with one eye, and either dispells or changes it's shape with the other. Either way it's manifested through the eyes.