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@Poppy
Hi Guys,
Cheers for the ideas.
Air pressure via a pump is one method I've already investigated, the advantage is that the "device" would form part of the piece and that triggering through a valve would be relatively simple and the only mess would be the paint.
Dry ice is a nice idea I'll have a read through on that.
Baking soda and vinegar also has a lot of potential but the mess could compromise the rest of the work.
Do please keep the thoughts coming, they're much appreciated.