Blaze Release

is an advanced chakra nature. Sasuke Uchiha uses this technique when modifying the unquenchable black flames of Amaterasu. It is unknown what this nature entails. C states that Sasuke manipulates the flames with his right Mangekyō Sharingan whereas he casts Amaterasu with his left it has been sugested that this is a special element release within the uchiha clan presumably gained when the user gains their mangekyo Sharingan with willing aid from their sibling as was the case were Itachi implanted Amaterasu within sasukes sharingan.

(it is also thought that this release isnt a blood limit and can be done due to the sharingans power increasing to a certain level)