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Well that answers the question, thanks. Maybe it also explains why my wifi signal is so badly attenuated between floors, which was the reason for having to drill the hole in the first place!

Yeah just an unexpected surprise to have to clean up - fortunately i was only drilling a small hold for a cat6 cable!

Thanks for the reply. I do live in Scotland (semi detached, not a tenement), so maybe some sort of sound insulation. There was a chimney but on the opposite side of the room so I would assume any open fire would be on the opposite side of where I was drilling. The material is carbon black when...

I live in a house built in late 30s and while installing some network cabling between the ground and first floor I drilled through the ceiling to be showered in black gravel. No harm done but I jst wondered if anyone had any idea what it was and why it would be located between the ground floor...