Noce is a travertine with a delightful caramel brown color.
Travertine tile grout color.
This stone is suitable for floor and wall applications and can be used as an accent or to cover entire spaces.
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.
Iranian travertine offers light golden brown and cool light mocha brown.
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Unfortunately in this case it sounds like the darker grout did absorb into the travertine tiles and stained the travertine.
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.
This is particularly true for a rougher tumbled finish.
If you re wanting to contrast and go darker as patrick has suggested i would use 59 saddle brown.
Travertine is more about texture than it is about wild coloration.
Grout in a darker color can be chosen to fill the holes and lines for contrast.
I use custom building products grouts 122 linen would be great product to blend with.
It is advisable to seal travertine tile prior to grouting when using a darker colored grout.
The color travertine you used is a pretty common color.
Travertine has a pitted mottled texture layering and an even light beige color.