Hello
I have white tiles with gray grout in the bathroom, except for a vertical row of black mosaic (not glass).
For the mosaic, I want black grout, but how do you solve the joint between the gray and black in the simplest way?
I want to avoid the gray becoming black.
Could tile oil on the gray grout be sensible to use?
Just tape the gray grout and keep a steady hand?
All tips are gratefully received.
-/Christian