Board Thread:Theories and Speculation/@comment-6769189-20150307180344/@comment-25283946-20150309140134

Darui's Black lightning is lightning release (Raiton), It has not Yin chakra. We have seen different colors of lightning: blue, yellow, purple, black ... but they are always lightning release. Same for the flame, we saw flames color: orange, red, green, blue, black...but they are always fire release (Katon) Blaze release (Enton), this name suggests that you are using a different element, we have seen elements Kekkei Genkai formed by the combination of two primary chakras and the yin does not belong to this group. And the only possible combination with fire is lightning. http://img3.wikia.nocookie.net/__cb20150116230655/naruto/images/thumb/5/5a/Advanced_Elemental_Relationships_Diagram.png/373px-Advanced_Elemental_Relationships_Diagram.png