"Jeff" wrote in message
...

Just be ultra happy it was slate, not limestone. That etches faster with
the acid than the grout does...

Any chance you can enlighten us?

We are just about ready to lay a limestone tile floor in the kitchen
and we've never done this before. Any advice will be most welcome TNP.

Anybody who's ever known the delights of caving, or even that of a karstic
landscape, will have experienced what happens to limestone when acid as weak
as C02 dissolved in water is allowed to attack it over a long enough period
:-)

Put acid on calcium carbonate, ie limestone, and it'll happily bubble away
and dissolve. Not manic miner disappearing floor fast, so you'll be able to
wash it off, but if you're trying to shift other stuff with acid, you'll
probably lose.

cheers,
clive