In advance, I apologize for a seemingly dumb question.
We recently bought a house (built in '47) and are in many ways in the process of renovating.
In the absence of other things to do, I started tearing down a wall in the basement that is not supposed to remain (not load-bearing as it doesn't exist in any of the other houses on the street that are similar/built at the same time).
After I got a bit further, I noticed that one of the "channels" was black. What could this be due to? Is it something to be worried about?
We recently bought a house (built in '47) and are in many ways in the process of renovating.
In the absence of other things to do, I started tearing down a wall in the basement that is not supposed to remain (not load-bearing as it doesn't exist in any of the other houses on the street that are similar/built at the same time).
After I got a bit further, I noticed that one of the "channels" was black. What could this be due to? Is it something to be worried about?
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