As I was reading this article, I thought they used fake blood.
…The three used blood, which they said was their own, to make the cross …
I wonder how big the cross was. How long did it take them to collect the blood.
“Three Anti-nuclear Activists Poured Human Blood in the Shape…” UPI. November 29, 1980. Accessed December 6, 2015. http://www.upi.com/Archives/1980/11/29/Three-anti-nuclear-activists-poured-human-blood-in-the-shape/2234344322000/.
“Anti-nuclear Protestors Protestors Pour Blood on Football Field.” Pittsburgh Post-Gazette, December 1, 1980. https://news.google.com/newspapers?id=S1ANAAAAIBAJ&sjid=yW0DAAAAIBAJ&pg=4504%2C23370
saleintothe90s 