Great little device. Clean, safe and simple to use.
Simply shake the bottle up and down a few times and then squeeze the bottle in a “puffing” way – and ‘hey presto’ a very fine powder which appears as fine smoke.
Handy to have in the pocket or instrument case.
No toxic disposal problems when empty – simply discard in normal waste. The SDS for the powder can be downloaded here:- Smoke Bottle Indicator Data Sheet