There are a few very important things that you need to know about taking care of your tiles.
The grid lines are laser etched into the acrylic, so there is a top side and bottom side to the tiles which gives you the added bonus of being able to color the lines if you want. However, this is a PERMANENT decision. Once you mark the tiles in this way you won’t be able to remove or change the color. So when you are using the Tiles make sure you have the TOP SIDE UP.
If want, you can color the lines on the tile. This can be accomplished by using any thin point permanent marker. Just turn the tile over to the side that has been engraved (where the lines have been cut into the acrylic, you can feel it with your finger), then mark over them with the color you want, and wipe the excess off.
We suggest that you try them with the lines the way they are at first to see how you like it. We’ve made the lines in such a way that they show up well on any surface, including white, as you can see in our picture of the 6 tile set.