All that is left are the ashes from the body, plus nails and screws from the coffin and any artificial steel joints or metal plates. There may also be some bone fragments left. It tends to be the hip and the shin bones, because they are quite large. There will be more bones if it is a large-framed or young person. Young bones are stronger and reduce less easily. The remains are raked into a steel bin at the bottom of the cremator to cool, before being transferred into a machine called a cremulator, which contains steel balls that grind down the remains into a fine ash. Your ID card goes into the cremulator, along with a plastic urn with your cremation number on it that the ashes fall into at the end. The cremulator filters any artificial joints or metal and these are buried in a deep hole at the back of the crematorium, although we are looking into ways of recycling them.