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					Originally Posted by whitehse  I believe I remember looking at the foul line many times at Comiskey and realizing it wasn't just a chalk line but an embedded "line" of some type set into the ground.  I do remember the grounds crew taking a pain bucket and a rather large brush and going up and down the line painting the foul line.  I always wondered what that foul line was made of and I guess I now know!!
 Edited to add the foul line I am speaking of was only in the outfield....the infield was still chalked as it has been for years.  The outfield had a permanent foul line which is what I think the OP is showing here.
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 Thanks for the info. I figured it would be the OF. There is caked on white paint ontop.  Sides and bottom were definitely buried in dirt for sometime ( ends are not dirty from where it looks like it was cut from a larger piece for the auction). . Wonder if it is something they replaced every season or how often they would have replaced it.