What is this debri on the bottom of this hive?
Looks like cappings from where they uncapped honey to eat all winter.
Hard to tell from this picture, did you put a piece of paper in the hive ? Maybe from a combine.
Jim Altmiller
That looks like the wax cappings from a winter of feeding. Also some droppings and other trash.
I also was thinking it is capping shreds from opening honey cells. It doesn't seem like dirty, or sickly, refuse. The hive is strong and healthy. I see this stuff periodically, and wondered about varroa feces. I have not seen that yet, but I doubted it. Much thanks.