White of course to us, means light and goodness. It means God whereas darkness would take us to the unknown, evil, demons and anything of a negative connotation we relate to black. For just a moment, think about a dark and stormy night, walking down a dark street or alley, the lights going out in the house, rendering the rooms to total darkness. Think about what emotions that stirs within you as you focus your thoughts on those things. The darkness scares us, overall.
Imagination really takes over bringing all kinds of horrors to mind.
I was talking with a young lady down in St. Augustine this year and she started to relate a story to us about a terrifying experience she had a few years before. She was staying at a beautiful resort hotel, known to be haunted. Everything seemed to be going just fine until she walked upstairs to return to her room and saw, at the end of the hall, a dark misty substance. She suddenly was overcome with the feeling that it was evil and it scared her half to death. The dark mist faded away and nothing transpired to indicate that the mist was demonic in nature.