That's a direct system. There are much better remote detection systems for explosives that deteriorate so quickly (1/3 mass loss per week).
Oh yeah, and "acetone" is what we commonly call nail polish remover. It packs a smell.
Israeli invention detects TATP explosives
http://web.israelinsider.com/Articles/Briefs/4884.htm
That's a direct system. There are much better remote detection systems for explosives that deteriorate so quickly (1/3 mass loss per week).
Oh yeah, and "acetone" is what we commonly call nail polish remover. It packs a smell.