Quote ( Q ): As BeardedBruce says, anyone with chemical knowledge can produce a powerful bomb that looks like an innocent liquid. Something to generate oxygen, plus confinement, is all that is needed. But he also puts in the joker- many of these 'simple' chemical recipes produce a very unstable product that can go off before its time. ..."

Which would seem to beg the question: Why would such liquid explosives be considered safe in checked luggage - which gets jostled and bounced around a helluva lot more than carry-on baggage does?