The deep purple before darkness (the world beyond Death)

There is a type of ghosts who are the people had crossed over into a new life, but who sometimes come back and look over the people they ey live in the purple of the sky, the deep purple that you can find just before darkness 's the world, beyond the door of Death. In special days, the clock ticks and they come out,a day like reopening of Weasley's wizarding Wheezes