Tenax works but the buff is very light and doesn't look good on my gold/mottled travertine. The additive's brown color disappears when mixed with Tenax, yielding a color that's more purple with no hint of brown. Finally I used a 360 clear epoxy for granite. It is transparent in small holes but opaque in large holes. At least it doesn't jump out in contrast. Tenax with LOW brown content can be used for openings in subdued areas. Material will spill out when flush cutting if you haven't cleaned the soft, demineralized areas around the hole. The renovation has no polished finish. This is normal unless you have a high gloss polished floor. If this is the case, you have a dull scratched area around the repair where you scraped the flash. Now I will try to fit my new wet stone grinder with diamond polishing pads. Adding to Tenax does not produce brown or anything like that.