Hopefully it’s just some form of dirt whether it is residue from one thing or another from the sealer to the procedure.  If it is any residue, a small degreaser and a small steam machine with a small plastic brush attachment will remove it without affecting anything.

 

The other thing it could be is residue from the old sanded grout or installation glue, which had no real appearance until you completed the job.

 

That means to remove it , it would demand the impossible task again to scratch it out but you need to repeat many of the step again then

 

1-scracth them out

2- refill with new grout

3-rehone to complete the work

 

If that’s too crazy to do , then get some grout coloring, just paint it on touching the black lines, let it dry a touch and wash off the residue. The slight tinting may camouflage the black line enough not to make anyone crazy.

 

If anything is unclear email me back I will go in more details.

Ciao

Antonio

Marble Maestro  

 

 

 

I am on a job site right now working on a travertine project.  The installer had used sanded grout, then applied a color enhancer without getting all the haze off, then used an acid based cleaner to try to remove the haze and then sealed it with an impregnator...great, huh?  Well the travertine turned an orange (ish) color.  We removed the sanded grout, filled with an un-sanded grout, removed the lippage, grouted again, honed to 250 grit, grouted again, used a 400 grit honing powder and have been cleaning up.  We got rid of the orange color and returned the stone to its original color.

I noticed these black marks on the edges of most of the grout lines.  They are not gaps in the grout, they are black marks.  I have no clue where they came from.  What would you suggest I use to remove the marks?

Thanks All

Georgia Rivera
Stone Buff

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