I find it amazing that the people who look at xray images of our luggage are
so unfazed by the myriad things they see on their screens. I do believe
there is some (highly-hush-hush) system whihc colours the images so that
unstable substances appear distinct from the rest.

In any case (pardon the pun!) those looking at screenfuls of images of bags
on their way from the UK to Sharm or Hurghada must have seen so many regs
they can probably tell the make and model from the silhouette, just like
gunners know their and their enemy's ships and 'planes!

Having said that I was once called to security to open my hold luggage and
show the nice gentlemen hiding behind screens what it was I had in my bags.
Only once I opened them and showed them coils of RG-58 coaxial cable and
half a dozen glass spheres which turned out were promotioonal glasses for
Dooley's drink did ANY of them display what for them passes for a sense of
humour.

K