This is another experiment that other investigation groups have used in the past which has given interesting results. The idea is to spinkle talcum powder down over a floor where footsteps have been heard or things have moved to see if any imprints will be made. Also, such powder can be sprinkled onto trigger objects to see if anything appears if said trigger object moves during the investigation. To be able to clearly see the talc on the floor (and to ensure that absolutely no mess is made) the talc is spread evenly over a black sheet of lino or bin liner. Slightly crude but by no means less effective. The best place to set the floor experiment up is undoubtedly where people have reported seeing figures or hearing footsteps.