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Muratic acid wont do it. Calcium hyperchlorate isnt strong enough, and anything stronger you would need a permit for, and it would probably ruin the tile anyway.
I am sorry but the color of tile is pretty much fixed. Tile exposed to the sun will bleach out in a few years but I dont think you want to wait that long.
You can paint tile but it is a very dusty process just to get the surface prepped.
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