Dear Pierre:
If they have a shiny finish they can't be hone-finish. Hone finished travertine is smooth and scratch-free but dull, not shiny. So I must assume that your travertine is polished.
“
The back is fairly uniform (no cavities like you see on some tiles)
”
Well then, are you sure it's travertine at all?... With that piece of information I kinda doubt it. It sounds more like polished marble or limestone. Not that there would be anything wrong, mind you, but it is just that you may have been misinformed about those tiles.
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http://www.marblecleaning.org/purpose.htm?
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Ciao and good luck,
Mauri
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Article ID: 667
Created On: Sat, Oct 20, 2007 at 5:35 PM
Last Updated On: Thu, Nov 19, 2009 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=667