I use custom building products grouts 122 linen would be great product to blend with.
Travertine tile grout color.
Grout in a darker color can be chosen to fill the holes and lines for contrast.
It is advisable to seal travertine tile prior to grouting when using a darker colored grout.
Both warm and cool and light and dark shades are found.
If a matching grout is used it just won t look like travertine.
The color travertine you used is a pretty common color.
Unfortunately in this case it sounds like the darker grout did absorb into the travertine tiles and stained the travertine.
This is particularly true for a rougher tumbled finish.
Travertine has a pitted mottled texture layering and an even light beige color.
Noce is a travertine with a delightful caramel brown color.
This will darken the overall color off the travertine tile but the natural look of the holes will remain and the holes will be filled.
It s a stone that gives your kitchen or bathroom backsplash floor or bath shower walls or surrounds an ancient roman look.
Other than the meek color it s not for the design faint of heart.
If you re wanting to contrast and go darker as patrick has suggested i would use 59 saddle brown.
Iranian travertine offers light golden brown and cool light mocha brown.
Travertine is more about texture than it is about wild coloration.