What would an antimatter explosion look like?

It would not be a pretty blue glow. It would not result in a new sun in the sky. It would be an explosion like any other,but quick. It could be small, like a firecracker, or bigger than the largest atomic blast, depending on the amount of material. Expect an explosion, a fireball, and a mushroom cloud, like an atomic weapon, but not a blue light or an implosion of any kind.