Finally, a light layer of gray-black. There is a laminate sample next to the concrete square. This is where we pulled the colors from. I brought in a sofa cushion and one of the dining chairs to check the color. They looked very nice together. The floor is not too light or dark, not too pink or yellow. It is going to be a nice neutral backdrop for furniture and rugs and added color on the wall.
After the lines were laid out in tape, a second coat of concrete was spread on the floor and the tape pulled up, leaving "grout" lines. This second coat is a buff color...actually attractive all by itself! After that dried, the guys begin to stain the concrete. A base coat of stain is rolled on, just like painting a wall.
There was some debate about how to lay out the lines. I was concerned that we may end up with tiny pieces of squares that would look out of place and off center in the kitchen and hall. I tried drawing it out many ways...with borders or change of scale...but it got very complicated, very quickly. We finally decided to go with a simple 30" square centered in the front entry and radiating from there. This photo shows how the lines ended up in the kitchen.
I'm in the far corner of the living room, looking back towards the front door. You can see that the tiles are gone from the entry, and that the grout lines have been laid. This is a cool process! First, they spread a thin coat of gray concrete mix very thinly over the existing slab. Then they lay out the lines with skinny tape.