Look into the floor  using a magnifying glass, the tape may have pulled
micro particles or minerals from the stone.
Fred Hueston and I had a case where the minerals pull from the stone and no
matter how we honed, what chemical we used we could not remove what appeared
to be the tape lines.
The magnifying glass will answer this question. If the tape did not damage
the stone try mineral spirits or alcohol.

John E. Freitag
The Stone and Tile School.

-----Original Message-----
From: list-manager@stoneandtilepros.simplelists.com
[mailto:list-manager@stoneandtilepros.simplelists.com] On Behalf Of Dayron
Sent: Monday, August 25, 2014 4:24 PM
To: Stone and Tile PROS Technical Support
Subject: Basalt floor tape marks

Client just called me tape left these marks,  they tried acetone and
nothing. I'm going to do a demo with 400 grit honing powder.
Any suggestions ?

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