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Discussion Starter · #1 · (Edited)
We are restoring a small bathroom in a 90 year old home. A prior owner laid tile using thinset over the original black & while tile floor, which is a beautiful pattern (visible inside cabinets). Approx. 26 sq ft.

(1) Is there a technique for carefully removing the 2nd layer of tile to expose the original tile (some has already fallen off)?

(2) If we're successful, is there a way to then remove the thin set from the tops of the original tile?
 

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Welcome to the Forum.
Sorry there is no chemical remover for old hardened Thinset. It can be mechanically removed fairly easily from concrete, but this method on tile will likely result in damage to tile.
 

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Try a thin bladed scraper---the tiles should pop loose.

Those old black and white mosaics were usually a solid body porcelane with a mat finish---

If so, you should be able to sand the thinset or with 150 or 220 grit paper in an orbital sander without damage to the hard porcelane tiles.

Try a spot and see---no chemicals,please---any thing strong enough to loosen the thinset could damage the set of the original tile.
 
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