I think I know what you are talking about. Is it one solid core a little less than a 1/4 inch thick? If so it is old overhead wire.
You can remove the "tar" type substance by taking a hammer to it. Put your wire on an anvil, or the flat portion of a vice and just whack it and it will split the insulation. Couple inches at a time.
You can do this on a cement floor also, but that's hard on an old man's back. I'd rather stand or sit on a stool and do the whacking.
Then rub it on the edge of the flat parts of the vice to remove any sticky residue.
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