4:30 p.m.
The reason why, in the movie, Dawn of the Dead, 1978, the blood looks so real, is because 3M made those.
By the 1970s, 3M developed a theatrical blood formula based on red colorfast microbeads suspended in a carrier liquid. This stage blood was sold as Nextel Simulated Blood and was used during the production of the 1978 film Dawn of the Dead. It has since been discontinued.
