Blood/Legends

"The average humanoid adult has a blood volume of approximately four-point-nine liters, of which two-point-seven liters is plasma. Humanoid survival with an untreated Class Four blood loss&mdash;that is, greater than forty percent of total volume&mdash;is unlikely for more than a few minutes. The amount of blood soaked into this carpet is, I estimate, nearly three liters. Even if the deceased had recently spent some months at an altitude sufficient to have radically thickened his blood, his red cell count could not be sufficient to allow survival with such a volumetric loss."

- I-5YQ, on the stabbing death of Ves Volette

Blood was a bodily fluid that many species had. It provided a way for the body to transport oxygen, nutrients, waste and other things vital to survival over the body. The color of blood varied between species. Most species, including Humans, Chiss, Zabraks, and Aqualish, had red blood. Duros, Falleen, Rodians, and Trandoshans had green blood, Rattataki and Talz had blue blood, Geonosians had yellow blood, Judd's Species Devaronians, Aleena, Massassi and Yuuzhan Vong had black blood.

According to Han Solo, the taste of blood was roughly equivalent to the taste of liquid tin. A blood transfusion from a Force-sensitive to a non-Force sensitive would not grant the latter a connection to the Force. In 3645 BBY, Sith Lord and alchemist Darth Scabrous used a backpack-mounted intravenous device to transplant uncontaminated blood when he was infected by a zombie-creating virus known as "the Sickness". This slowed the rate of transformation, allowing him to survive much longer than others who were infected.

Behind the scenes
Blood is occasionally visible in the Star Wars films. In Star Wars: Episode I The Phantom Menace, Qui Gon Jiin has blood stains on his shirt when he is stabbed by Darth Maul and a brief splatter of blood can be seen when Obi-Wan Kenobi cleaves Darth Maul. In Star Wars: Episode II Attack of the Clones, Obi-Wan has blood on him after Dooku cuts his arms and legs. In Star Wars: Episode III Revenge of the Sith, blood can be seen inside the canisters of the medical droid when Darth Vader is receiving medical treatment after losing the duel on Mustafar against Obi-Wan. In Star Wars: Episode IV A New Hope, Ponda Baba lost his arm to Obi-Wan's lightsaber, which produced a trail of blood. Following that, every subsequent time a limb is amputated on-screen or a wound of any kind is inflicted by a lightsaber, the lightsaber flash-cauterizes the wound, resulting in little to no blood loss or any visible blood. With each instance of mutilation, dismemberment, punctures, or other wounds scene in the Star Wars series, little to no hemorrhaging or gore can be seen, with Padme getting scratched by a nexu, Corde's bloody figure, and the bloody wounds on Shmi Skywalker being some of the last instances of blood in the Star Wars series. It was only until the Clone Wars series and Revenge of the Sith did blood and gore become truly absent from the series, with the exception of Anakins burnt, mutilated figure after his defeat by Obi Wan. Also, usual deaths on Star Wars will include wounds that are cauterized or burned, with any bloody or gory injuries being shown on screen.