Looks like crystal damage which means it is very deep. Sanding it out would make a channel. I would do some tests. They might have to change the tiles. 

On 15 Nov 2016, at 9:11 am, stuart rosen <mail@stoneshine.com> wrote:

Chris,
We use diamond or silicone carbide brushes on a Frankfurt Driver.
Seems to work well if you have a stronger machine for deeper scrtaches-

On Mon, Nov 14, 2016 at 11:16 AM, <csantospago@gmail.com> wrote:
Sorry I forgot to attach a picture in the previous email.

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Regards,
Stu Rosen
201-446-1200

"EVERYTHING MATTERS"


 
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<2016_11ANTIQUEINGBRUSHES.jpg>