Travertine is one of the most porous stones available. This
is not good for countertops! These countertops stain quite
easily and then you are stuck with it. Travertine is very
predisposed to acid. Acid will etch the surface and stain it.
Lemon juice will even mar the surface of the counter. You
are not to leave any liquid standing on the countertops,
even water, for a short period of time because it could sink
in and stain. Travertine countertops require a lot of regular
sealing applications to keep them from staining. Even
putting Travertine in a bathroom is a bad idea because
many soaps/skin creams are going to stain/etch it
Travertine is porous, and easily stained and is etched by
acids. Avoid setting beverage glasses directly on Travertine
as they leave rings. Fruit juice, carbonated beverages or
other acids will etch (remove shiny surface) if allowed to
remain on marble. Wipe up acid spill immediately, and wipe
surface with wet cloth. If surfaced is etched, polishing may
be required.