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

Well, yeah. 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' require hand seals. It's all manifested through the eyes.