Grout dries

From the very beginning, carefully inspect the entire surface on which the tile is laid. If you see laying errors, which are usually small irregularities or the difference between the sutures of the tile, then you should choose the grout precisely in the color of the laid tile. After you grind you yourself, you will see that all the small error will become visually less noticeable, therefore we have reached the result. The difficulty is that you need to choose the color in tone (you can make the grout a little lighter, however, not more than two tones, otherwise the effect will not work). Keep in mind that when the grout dries and loses moisture, it becomes somewhat lighter, so it is better to try it on a small area first and if you like the result, it means to continue throughout the amount.