When my grandpa was cremated, we went in the cremation room to see him for the last time. Then we stepped out. After a couple of minutes, we got back in to see the remains. Apparently there are still a lot of larger solid bones that remain, and they have to ground them up into the “ashes” you normally would see. We step out of the room again, and they come out with the urn containing the ashes after another few minutes.