Talk:Firebending/@comment-121.55.221.29-20100910090517/@comment-3075159-20100925074525

Firebending can be partially controlled by rage. Azula has excess rage.

Blue fire is hotter than red or orange fire, and white is even hotter than that.

So Azula has an excess of a powerful negative emotion, her fire is hotter, and therefore her fire is blue.