black slate tile discolored

"Scrubbling Bubbles" cleaner ( contents n-Alayl -60% ammonium chloride}accidently released on Black slate tile staining them a drak gray.How can I get them back to their black color

 

Dear John:

If the stone gets back to its original color when wet, then the application of a good quality stone color enhancer like MB-6 will do the trick for you by giving you the “wet look” (without any sheen) permanently.

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,

Maurizio Bertoli

 

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