It won't stay this white. As they track their dirty little bee feet over it, it will go from bright white to black.
They are also busy making babies. This solid brown below is capped brood...babies almost ready to hatch out as working adult bees. I'm thinking the new bottom board must give them a little extra room at the bottom, because they've stretched out their comb below the frame.
Since they had almost filled their deep box, we added a second story. The deep we put on has all drawn out comb. It is the deep box we took off the bottom of the leaning tower of bees last fall. I kept the frames in the freezer part of the fall and then stored them with chemicals to deter moths the rest of the winter. They've aired out and are ready for occupation and use.
When I went out to put a new bottle of sugar water on this hive, the bees had already moved up into the new deep. They looked happy to be there.
We also checked on the older hive. They have not moved up into the new super, despite me hanging a frame of honey right smack in the middle of it. We'll keep an eye on it over the next week or so. If they continue to balk, I might take out the queen excluder. I suspect they just haven't needed it yet.