Hi - I bought a 2' x 7' x 2" peice of bluestone (or so the stone yard tells me) for a fireplace hearth. Its basically a grayish-blue color. I want to darken the color. As dark as when I pour water on the stone. Maybe even add some brown color to it. I suspect this might be possible because some stones (granite countertops?) need to get sealed to prevent discoloration from spills. My question is how? I.e. what type of solvent should I use. I want to use a dye since the dye particles are much smaller than the particles in a stain and figure they will penetrate. But should I use water or oil or what? Or is there no hope for the dye to absorb into the stone and I need only a surface stain. And whatever solvent I use, what sealer should I use afterward? and will any of this be different because it will be close to the fireplace? Thx for any advice. -yurij