Final answer:
In the iconic shower scene of 'Psycho,' chocolate syrup was used to simulate blood due to its effective contrast in black and white film.
Step-by-step explanation:
The substance used for blood in the shower scene of Alfred Hitchcock's film Psycho was actually chocolate syrup. Since the movie was shot in black and white, the syrup provided the necessary contrast to appear as blood on camera. This choice was both a creative and practical solution for the filmmakers. In the famous shower scene in the movie Psycho, a specially formulated fake blood substance was used. The substance used for blood in this scene was a mixture of chocolate syrup and red food coloring. The combination of these ingredients created a realistic and visually striking effect that was convincing on camera.