What is the best products and procedure to rmove the etching (a cloudy circle) on a (12 inch x 12 inch)polished black marble floor tils caused by oxalic acid rust remover.

 

Dear Harold:

If the etching is not too severe (dark to medium gray and smooth) you could try with a product like MB-11 ( http://www.mbstonecare.com). But if it is too severe (light-gray and almost whitish and a little rough), then you will need the services of a stone restoration contractor who will have to slightly grind (hone) your damage before polishing.

 

May I ask you now to please read and e-sign our Statement of Purpose at: http://www.marblecleaning.org/purpose.htm?   :-)

Ciao and good luck,

Mauri z io Bertoli

 

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