I have had a few questions about how the shots were taken, so here I'll make a brief description of my test setup.

An exploding lamp sends zillions of pieces of scrapnel and other debris around, so I had to build some kind of sealed setup. The high-speed photography "studio" was simply built of some pieces of wood, chipboard, cardboard and duct-tape.

A home-built shock-sensitive trigger is used to fire a flash. A programmable delay which can be set in 100µs increments is used to capture with a slight delay.

A shot is taken in the following steps

a) The "studio" is set in darkness
b) A shutter time of 1 second is set
c) The shutter is released
d) The item is dropped
e) When the item hits the trigger plate [and explodes], the flash fires and the actual exposure occurs.
f) When one second has elapsed, the shutter closes...

A few milliseconds delayed trigger yields more scrapnel :)

This means that the camera is not synchronized with the actual exposure, rather than fairly roughly within one second. The flash illumniates the object when the trigger detects the shock pulse in a trigger plate.