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. That is why they are not used commercially. Torn flesh and deep burns, but nothing more serious was the result of some of the experiments of my junior high days. We were lucky. Old (before WW2) chemistry books are full of means to produce an explosion, but they caution about close confinement in containers.