Steve:

Is this a chemical fact and can you also state this from repeated personal
experience or is this from passed on knowledge as in it was heard someplace. I am
asking because this is an interesting / easy test and I had assumed that gasoline
would cut  both.

?
Bryan
-------
"S. Stokowski" wrote:

>   One can easily tell the difference between tar and
> asphalt with gasoline.  Asphalt dissolves in gasoline, coal tar does not.
>
> Steve Stokowski
> Stone Products Consultants
> http://members.aol.com/crushstone/petro.htm
>
> In a message dated 10/12/99 11:10:30 AM Eastern Daylight Time,
> [log in to unmask] writes:
>
> << I've been in a lot of old theatres lately, and am noticing a black
> substance
>  on the interior face of the bricks. It seems that bricks making up walls
>  with an exterior face have had their interior side coated with some
>  elastomeric substance, or maybe...pitch? We figure that it was some sort of
>  barrier between the brick and the scratch coat of plaster applied directly
>  onto it. Any takers? >>