What could be the possible science behind the Foxfire

We are hopefully all familiar with the fact that Kitsune such as Senko is able to conjure Kitsunebi (fox fire). And I know that the most likely answer to any questions about Foxfire can just be boiled down to Magic, but that is kind of a boring answer, and I am a man of science. So, what could be some scientific explanations for the properties that we see of Foxfire? We could start off with the Hue of the flame, and the go from there.