As any one here who frequently uses the London Underground knows, there's a "lovely" fine black dust that seems to coat everything (and is extra lovely when you get home and blow you nose, only to discover you're actually carrying about 1lb of it up there!)
Anyway i'm slightly curious as to what the hell it actually is.... I guess it could just be 'normal dust' (i.e. dead skin etc... ew) plus brick dust from the tunnels and other bits... but i've also read that (apparently) it's actually fine metal grindings, from where the wheels grind away at the track!?
Anyway - anyone have any ideas?
Anyway i'm slightly curious as to what the hell it actually is.... I guess it could just be 'normal dust' (i.e. dead skin etc... ew) plus brick dust from the tunnels and other bits... but i've also read that (apparently) it's actually fine metal grindings, from where the wheels grind away at the track!?
Anyway - anyone have any ideas?