Black soot behind render

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#1
Hi guys I’m hacking off walls and have found what looks like soot behind the render any idea what it is??
 

beader

Private Member
#3
Errrrrrrrrrrrrrrrrrrr no. Some picture or more detail might help.:rolleyes:
 
Love CBD

Dropsalot

Private Member
#6
If it were a black stinky powder...... I would suggest it could be soot......otherwise I’m stumped.....
 

beader

Private Member
#7
Does it look anything like this?