Cement grout coloring?

I had many of the bluestones in my patio reset and re-grouted by a mason. Now the new dry grout (made with portland cement) is a very different shade of grey than the non-replaced grout which has been there for upwards of 30 years.
Is there anything I can purchase at Lowes/HD that can soak into the grout to make it a more uniform color/shade?
Thanks, Walter
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Not sure if there is anything specific avail for grout, but I would think one of the semi-transparent concrete stain type products could be used. Not sure if you can get it perfectly uniform, but it would probably help even it out.
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