HI I HAVE RECENTLY HAD BLACK PORCALEIN TILES LAID, AND HAD BLACK GROUT TO FINISH. THE GROUT HAS DRIED GREY WHICH IM NOT KEEN ON, SO IS THERE ANYHING I COULD USE TO TAKE IT BACK TO BLACK . I ALSO THINK THAT THE TILES DONT SEEM TO BE AS SHINEY AS THEY WERE BEFORE WE LAID THEM A FEW WEEKS AGO, SO ANY S...
