I only know of two ways to remove grout:
Travertine is a form of calcium carbonate and acid would eat it as well as
the grout. Calcium carbonate is also very soft and can easily be
scratched/damaged by scraping with steel.
I don't know what you mean by "adjusted to the edge area of the travertine
tile" but I'd try a wooden scraper. Hard wood.
Sorry for confusion, here is what happened: while applying some fresh
grout over a seam (to fix a wrong colored stretch) it was pasted over
the adjoining tiles.
Would using even fine sandpaper lead to the surface damage as well?
On ceramic tile, vinegar in water is used to remove fresh grout haze.
On marble, vinegar might affect the gloss. I would first try a marble
cleaner - follow label instructions. A non-abrasive plastic scrubber or
stiff nylon brush would probably help without scratching marble. Your
question is confusing. Is this polished? Tumbled? Floor? Large area?
I did a google search on "travertine remove grout haze" - lots of hits,
including commercial products:
The tiles are filled and polished. The affected area is where a wall
meets the shower stall floor made of small "mosaic" pieces. The first
row from the wall have been pasted over just yesterday.
I have been working with my Travertine for 20 years. The only way I
can think of fixing the situation would be to get a good supply of
razor blades and a blade type scraper and carefully scrape off the
excess. If you are careful and use the proper angle, you may be
successful. NO NO acid or vinegar, etc. The Travertine is very soft
compared to other stones and will etch quickly with any acid.
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