Originally Posted by
corporate-wage-slave
...
Marzipan, on the older scanners, had the same consistency as Semtex.
... and the marzipan smell is similar to that of a type of improvised explosive that certain type of searchers might have been alerted to!
Most commercial stuff has no smell (eg Semtex)
NB: I have a historical professional knowledge and qualifications for making things go bang