I had customer ask me about iron in Marble.
They have a Carrera Marble that is showing  a lot of iron discoloration.
The shower is less than 2 years old. Their friends have the same type of shower
bout 3 years old with no signs no discoloration. Is there any way to tell if iron damage
could occur before buying it?  Is any one responsible if it does occur in a short
period after installation? Such as the supplier builder?
Tony Warney
Excel Stone and Tile Care