As promised...
Here's the same tile (from the post below) after a 3 day soak in vinegar.
Not sure if you can tell by the picture, but there is a distinct difference between the lower area, which was the part that was submerged.
My first thoughts about this include a realization that if I want to use this glaze for dinnerware, it's probably not suitable. But if I want to use it for tile, it's probably fine.
