I just tried the acid stain on my concrete outdoor top. It was ebony but the for some reason the polished concrete did not color the same as the untouched block. The mortor was also a bit of dark brown color.
In this picture you can see the different color effects between the block, mortar, and the polished top.
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I ended up using concrete pool deck stain.
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I still need to clear the top but I have to wait for the concrete to gas off.