how long will this take?

Question

http://www.unitednuclear.com/negx.htm < how long will this mix take to catch on fire on its own. just curious

Answer 1

It would depend on the relative humidity. As soon as there was enough moisture in the mixture, it would spontaneously ignite.

So, on a winter day in the desert, it might take a long time. In the summer in Maryland, it might ignite immediately.