Devils of Darkness is in color. It reminds me a lot of The Satanic Rites of Dracula with Peter Cushing and Christopher Lee. It's kind of long on drama and short on the supernatural. I think it would be better if it was about 30 minutes shorter. I think I'll enjoy it a lot more on a second watching.
Witchcraft is in black and white and is a gem worth finding. It stars Lon Chaney Jr. with plenty of the supernatural throughout. If you like the movie House on Haunted Hill then you'll probably like this as well.