Here is a video of some drones hatching from the cells of the green drone frame. Ordinarily, there would be hundreds or thousands of worker bees covering this frame, but this shot was taken after I shook off the worker bees that were tending to the drone brood on the frame. The empty cells are from drones that already hatched. Luckily, I did not find any mites in any of the drone cells. I guess that means my powdered sugar treatments are working to prevent the mites.