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					Originally Posted by  Money pit
					 
				 
				, but the point is, I'm not sure what shape your rock will be in if left over night, you may end up with a lot less than you started with, 
			
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 lol, yes, like I said, soak for about 10 minutes to just dissolve the surface of the rock. Overnight would be messy.
Disposing of the acid is easy once you've added a box of baking soda to the mix. Just pour it down the drain.