Fog Machine Tips

dynamicvelocity said:

i'd love to know how they make the 'toxic' dark green colored fog that features in Dr Who and other TV shows every so often... i'm sure they were doing that long before digital after effects were added to television...

it's just that i can't picture a gas that is coloured ... i can't think of any - can sulfur (yellow) exist in a gas form?

yes, of course it's poisonous, i know that!

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