Painting a laser etchted image on Granite (http://tanbrown.org)

does any one know the best way to add some good color to a laser etched image that is done on absolute black Granite (http://tanbrown.org) ? I have tried a few kinds of paints but still can't get a good popping color. I have seen some good painted pieces from some companies websites and (http://maplered.com) I would like to get the same results.