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The linkto the allowed substances and those that have to be in 100ml containers that meester 69 posted is a useful guide, but it applies to LHR only. I see that talcum powder is on the list of allowed substances, but in an airport that was not LHR my talcum powder was confiscated and declared to be a liquid.

My biggest beef with security checkpoints at airports is that there does not appear to be any list of allowable stuff that is recognised worldwide, and thus there is no consistency in enforcement.