slave ghosts? that gives me chills. someone making up a story couldnt come up with random things like that, chalk like material on her clothes?
When I was in college, I cut grass for the county parks dept. One of the properties I mowed used to be connected to the Underground Railroad.
I never saw an apparition there, but would always see things out of the corner of my eyes, feel as if I was being watched, etc.
The original house from the property had been moved, and is owned by a relative of my brother's girlfriend.
The two of them used to house-sit for the owners, and both have seen a full-bodied apparition of a slave woman.