The tiles were laid on the floor. Unfortunately, the grout did not match the color at all. When it's wet, it matches perfectly, but when it dries, it becomes much lighter and the floor doesn't look good.
Is it possible to paint over it or is there only one option – a complete renovation?
There are oil markers on the market that we have used a few times specifically for this purpose. The color is much richer, it is not washed out or faded, you can always touch it up if you want a richer color. It's also true that the color palette there is not very large.