Why was Psycho filmed in black and white?

Related questions

1. Where ex machina was filmed?
2. Is the One Ring a MacGuffin?
3. Where was ex machina filmed House?
4. Can a person be a MacGuffin?
5. How did Alan Turing kill himself?
6. Has anything passed the Turing test?
7. Why did Ava betray Caleb?
8. What was in case Pulp Fiction?
9. What is a deus ex machina ending?
10. What is a MacGuffin in a movie?

Tags

1. #black
2. #psycho
3. #because
4. #hitchcock
5. #might
6. #murder
7. #swirling
8. #syrup
9. #audiences
10. #drain
11. #bloody
12. #chocolate
13. #reason
14. #white
15. #blood
16. #thought