This flag made of sailcloth was soaked in blood donated by anonymous volunteers and was put on display for the first time at the Anselmo Lorenzo Foundation on October 12th, 2021. The same blood was used to print the Spanish monarchical coat of arms.
The blood comes from territories that had been colonized by the Spanish Empire and from present day provinces of Spain representing those that existed during the Spanish Republic, forcefully conquered by the Francoist Catholic National Army during the Civil War, which imposed the monarchical flag that is still in use to this day.