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WASHINGTON, Oct. 27, 2017 � Fake blood is a staple of the Halloween horror film experience, but there’s no one recipe to suit every filmmaker’s needs. The chemistry of fake blood has always been tweaked to create the most realistic experience, or at least the most budget-friendly. From Alfred Hitchcock to Sam Raimi, join Reactions on a Halloween tour of the chemistry of gore:

For more Halloween chemistry, listen to our latest Science Elements podcast to hear a spooky Dickensian tale about spontaneous combustion, written by Sam Kean, author of The Disappearing Spoon: .

Reactions is a video series produced by the American Chemical Öйú365betÖÐÎĹÙÍø and PBS Digital Studios. Subscribe to Reactions at and follow us on Twitter .

The American Chemical Öйú365betÖÐÎĹÙÍø, the world’s largest scientific society, is a not-for-profit organization chartered by the U.S. Congress. ACS is a global leader in providing access to chemistry-related information and research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.