Board Thread:Theories and Speculation/@comment-26889573-20151008053113/@comment-26537507-20151011224224

Blaze release is an extension of fire release, like black lighting is an extension of lightning release. Yes the black flames aren't normally generated, you need a MS in order to perform the Amaterasu. But blaze release is fundamentally a high-powered fire release technique with shape transformation applied to it.

I don't recall the specific example you're talking about. From my knowledge, Sasuke can either modify the shape of the flames or put the flames onto a projectile like a Susanoo arrow or yasaka magatama.