Hi.  I have a Terra cotta tiled floor that has some water damage.  Mainly the issue is salt deposits that have risen to the surface under the glossy sealer.  My plan is to strip off the top coat and treat with a color enhancer/efflourescence remover like aquamix or aldon, and then recoat.  There are, however, some areas that have greyed out a bit and I was wondering if anyone has tried dying the surface of the terra cotta to further enhance/lock in the color?  I recall seeing a website that has something like this but I can't remember where, and not much comes up on google.