Hi Joan,

I find myself wondering if ozone might hasten the rusting of the iron in the strings and maybe even the oxidation of the winding of the bass strings. As mentioned, ozone is a strong oxidizing agent and iron loves to be oxidized (rust is the result of this oxidation). This is something that I'd check with the company. They would know. Likely, the amount of time that the piano is going to be subjected to the ozone will not be sufficient to cause any problems.

You could also have the company try out the process on a region of the piano that you rarely play (say the lowest bass notes or highest treble notes) and see what happens. If all goes well, you can then have the whole piano done.

Regards,
Noel


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