Marble is a metamorphic stone made of calcium carbonate. Acids easily eat into its surface which is why housekeeping doyennes advise “Never use vinegar to clean marble.”
Once the surface of the stone has been restored, it probably ought to get a protective coating of polyurethane which is neutral and would shield the stone from future chemical attack.
Thanks ...
I keep thinking of Cemetary headstones. Birdpoop is acidic, and Lord knows that they shine back up every rainstorm.
Hard to believe that masking tape would do anything at all to stone.
When contractors re-did a bank building I worked in, after they cleaned the marble they used a compound made of beeswax to protect it.