I’m 99% certain you’re right. They used the same technique for an early Dr. Jekyll and Mr. Hyde transformation effect. As I recall, they used red paint to paint shadows on the actor’s face. At the start of the shot they used a red light, which caused the red paint to not show up. Then they gradually shifted to blue light, which caused the shadows on the face to gradually appear. It is definitely an effective technique, but wouldn’t really work with color photography.
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