My concern with adding dyes to limestone the stone may absorb the dye and cause you more problems than dealing with the grout. You could actually have area in the limestone that could absorb the color and other areas would not absorb any of the color .
John E. Freitag
The Stone and Tile School
From: Paul Bunis [mailto:firstname.lastname@example.org]
Sent: Thursday, October 06, 2011 10:36 AM
To: Restoration and Maintenance
Cc: Restoration and Maintenance
Subject: RE: [sccpartners] Keeping black grout black durring limestone restoration
There are colored tints available thru Eastern Marble. Ask Stu. He turned me on to them. I think he is I'n class until tomorrow though.
On Oct 6, 2011, at 1:32 AM, "Mike Marsoun" <email@example.com> wrote:
I would find a suitable spinflex or twister pad and even then (if you are going to a 400 or less hone) you still run a risk. Pre seal, or pre wet your sections before starting. I would stay away from powders on this one.
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From: Info Info <firstname.lastname@example.org>
Date: Wed, 5 Oct 2011 23:13:45 -0500
To: Restoration and Maintenance<email@example.com>
ReplyTo: "Restoration and Maintenance" <firstname.lastname@example.org>
Subject: [sccpartners] Keeping black grout black durring limestone restoration
Next week we will be honing dark gray limestone with black grout lines and I must keep the grout as black as possible. We will finish with color enhancer but I can't tell if that will enhance the grout color to the original black. I was thinking about adding some kind of dye to the honing powder. Is this a good idea? What do you recommend and where can I get it?