What was the Fire of Orthanc

[Orc]

What do you think the Fire of Orthanc was?

For details about it go here (http://www.warofthering.net/armoury/forcesofevil/fireoforthanc.shtml)

[Orc]

Given that Gandalf has fireworks, I lean towards blackpowder over any other option

[Illuvatar]

I would have to say a Magic / chemical / alchemical combination would be the trick. See black powder and what-not can do neat things by themsleves. But combine explosives with magic and great things can happen!! :p

[Gil-Galad]

I think thaty it is chemical, and it sort of represents that saruman was taken away from the light (good magic) and to evil )(chemicals).

[Fatty]

I reckon Black Powder or other chemical explosive. Though remember Gandalf's affinity with fire was due to his ring too.