Board Thread:Theories and Speculation/@comment-33486170-20171124080415/@comment-734582-20171124091733

Amaterasu doesn't really behave like 6000-50 000 000 degree plasma like the sun though. I think the best way to handle it is to see it as normal fire, that burns unnaturally. E.g it burns anything it touches, but it doesn't melt it. And while normally it burns for those seven days and nights, it can be stopped (and often is) by the user. It also seems to stop once it's burned what it was supposed to burn.

E.g. Itachi burned down a forest and it kept burning. Itachi burned Sasuke but he forced it to stop. and Sasuke burned Shin's knives but once they were burned up the flames dissipated.

The statement about "as hot as the sun" obviously refers to the fact that it's called Amaterasu (god of the sun), but in practice it seems to mean that it can burn whatever it needs to, regardless of whether it's actually flammable.