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Can anyone tell me if this is limestone? I put muratic acid on it and it fizzed like crazy. Isn't that a bad sign? Thanks for the help. Happy Easter!
 

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False test!!! What you may have proved is that it is limestone. Looks like limestone from here. Maybe been rolling around in a river or creek to round off the corners?? Limestone is alkaline or a base. Putting acid on a base, one would expect a reaction or fizzing. I use a form of acid to clean my garage floor and it fizzes when it meets the concrete.
 

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No idea sorry. If you want to be on the safe side just don't use it.
 
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