You could try soaking them in water which may help depending on what the original adhesive is, if not it’s going to be an angle grinder job. I assume they are something special & justify the work?
No experience in this particular instance but I'd be concerned about a possible reaction between the new tile adhesive & any acid residue on/in the back of the tile.
No experience in this particular instance but I'd be concerned about a possible reaction between the new tile adhesive & any acid residue on/in the back of the tile.
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