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- Angel Beats!, pictured. Otonashi's shirt is still sopping wet with bright red blood after he recovers from being stabbed in the chest in the clinic. Even with the Healing Factor, some of it ought to have dried. Or, you know, reabsorb into his body, since that happens at a different point soon after.
- Averted in Appleseed: There' a rusty patch on the floor in an abandoned science lab. It isn't until a 3D security video is replayed that you realize it's dried blood.
- Dragon Ball: Bardock's headband, which was originally a white armband worn by one of his friends and was dyed completely red with blood after that friend's death, retains its vibrant shade of red during Bardock's final battle in "The Father of Goku", and throughout the events of the sequel/prequel Episode of Bardock.
- Averted in Johnny the Homicidal Maniac:
"Blood changes color when it dries! Don't you see? I have to keep the wall wet!"
Films — Live-Action
- Despite only having had a single bucket of blood dumped on her, the titular character of Carrie remained red and dripping as she walked all the way home. Then, due to the type of fake blood used, when she washed it off in the bathtub it inexplicably turned pink. And despite sitting around for hours, the blood hadn't coagulated or turned brown in the bucket before being dumped on Carrie's head. In the novel, it had been transported in buckets of ice, and had frozen in transit, to thaw between placement and deployment.
- In The Brothers Bloom, the visual difference between real blood and stage blood clues a character that they're being conned.
- During the opening sequence of the movie version of Stephen Sondheim's Sweeney Todd: The Demon Barber of Fleet Street a large amount of blood goes through several gears, into a sewer, and eventually washes out to sea — it froths and coagulates a little, but stays a dark pink/pale red the entire time.
- In the Agatha Christie book and movie Death on the Nile, Poirot finds the murder weapon (which has been chucked into the titular river) wrapped inside a cloth. The mysterious pink stain on the cloth leads Poirot to suspect that one of the passengers faked a bloody injury (using red nail polish) in order to create an alibi for himself.
- The blood on Coulson's vintage Captain America cards in The Avengers... which turns out to be the first clue that Fury didn't find them where he said he did. They were in Coulson's locker when Loki stabbed him. Whether that means Fury just added the fake blood for extra punch or something else has yet to be seen.
- Averted in The Wolfman (2010): the dried blood we see on Lawrence ranges from rust coloured to almost black in some instances.
- Deadpool's original white uniform is still bright red from the blood stains at the laundromat, long after the blood had time to dry up. (It could be considered Fridge Brilliance once you realize that his cells are immortal and never die.)
- The redcap is a particularly vile goblin from British folklore that waylays you on the road at night, kills you, and soaks its hat in your blood; really it should be called the browncap. (Of course, it does go out of its way to get fresh "dye" every night...)
- In the Merry Gentry series, certain Redcaps (see Folklore above), usually the most powerful ones, have the magical ability to keep the blood on their hats from drying out and rusting.
- Averted in Nick O'Donohoe's The Magic and the Healing. The Big Bad's fascination with washing her hands with blood moves her to kill a lot of things, because the blood never stays fresh and red for very long.
- Averted in the Heralds of Valdemar series. The robe of the Emperor of the East is described as the red of freshly spilled blood. The uniforms of his soldiers is described as the reddish brown of dried blood. The soldiers joke that this is so that you can't tell whether or not they've gotten blood on them, thus reducing laundry bills (It may even be the truth).
- Averted in The Lost Years of Merlin, where a desert region called the Rusted Plains are repeatedly compared to dried blood.
- Averted in the Chronicles of Prydain. The sword Dyrnwyn's scabbard is black from dried blood.
- Averted in A Study in Scarlet. Holmes discovers a method of detecting haemoglobin through a chemical re-agent and is overjoyed because it now gives people an infallible test for bloodstains.
"Criminal cases are continually hinging upon that one point. A man is suspected of a crime months perhaps after it has been committed. His linen or clothes are examined, and brownish stains discovered upon them. Are they blood stains, or mud stains, or rust stains, or fruit stains, or what are they? That is a question which has puzzled many an expert, and why? Because there was no reliable test. Now we have the Sherlock Holmes' test, and there will no longer be any difficulty."
- Death on the Nile has the bloodstained cloth wrapped around the gun. When they pull it out of the titular river, the water has diluted the bloodstain into a pink color. Then Subverted when Poirot correctly indicates that blood would not turn that color from the water — it's actually nail polish. The fact that it is not blood when the apparent sequence of events indicates that it should be is what puts him onto the killer's trail.
- The pool of blood in which baby Dexter was found seems to have been made of this trope as it would have started to coagulate. Crime scenes he investigates as an adult also seem prone to this.
- Justified with the blood in Marina View Hotel because it had been refrigerated and mixed with anticoagulants.
- The suspicious redness of a bloodstain was a vital clue in an episode of Jonathan Creek.
- The Wire falls into this trope, despite being otherwise brutally realistic. Not a drop of blood turns brown, despite the fact that the show frequently shows the murder, the investigation, and how much time has passed in between when the blood should have turned brown.
- Lampshaded in an episode of Millennium. Two people working on a slasher movie were fooling around with bags of fake blood shortly before they were murdered. This caused the crime to appear much more violent than it actually was. As Frank Black arrives at the scene he soon tastes some of the blood (to the puzzlement and revulsion of others present) and comments that it is fake blood, which he already figured out since real blood turns brown as it dries.
- Lampshaded in the "Tuesday the 17th" episode of Psych. While searching for a camp counselor who's been missing for days, Shawn, Gus, and the other counselors find her bloodstained pajamas in the laundry room. Later, Shawn comments that real blood would have dried and started flaking off by that point, which clues him in to the fact that it's all a hoax; the counselors are beta-testing a murder mystery/horror weekend they intend to hold at the camp.
- In Unsere Mütter, unsere Väter SS-Sturmbannführer Hiemer's face is splattered with blood when shoots a Jewish child in the head, and several scenes later he still has bright red stains on his neck.
- In the "Hook Man" (S01, Ep07) episode of Supernatural, bright red blood announces "AREN'T YOU GLAD YOU DIDN'T TURN ON THE LIGHT?" on the wall of Lori and Taylor's dorm room.
- Often appears in Warhammer 40,000.
- For some factions (especially Khorne, the Blood God) it's presumably a magical gift.
- In the case of the Eldar God Khaela Mensha Khaine, also known as the Bloody Handed God of Murder, the blood that drips eternally from his hands is that of the Eldar hero Eldanesh, whose murder began the War in Heaven and caused Khaine's curse to eternally have Eldanesh's blood on his hands.
- Space Marine blood is both hyper-oxygenated and clots nearly instantly. Depending on the Writer this can lead to spilled blood staying crimson long after it's stopped flowing.
- Games Workshop offers a paint named (appropriately enough) "Blood for the Blood God" which is a livid, glossy red for painting blood spatter and gore on your models. Since it's a gloss paint, the "blood" will always look fresh.
- The World Eaters, Khorne's dedicated berserkers, have red-and-brass armor, which was blue-and-white pre-Heresy. Naturally, the idea is that they've done so much killing that their armor has been stained by the blood, but the Real Life aversion of this trope refutes it (In-Universe even).
- In 99% of violent video games, old bloodstains might be, for example, reddish-brown at the darkest; and new blood will be red and stay red no matter how long the corpse lingers.
- In Bioshock, not only are all the blood stains bright red — many of which must have been there at least a year — they're still wet and shiny!
- The Chzo Mythos games play this pretty straight most of the game. There's one notable exception in Trilby's Notes with one room that needs to be opened from the Dark World. When analyzing the brownish stains in the room, Trilby identifies them as dried blood and deduces the room must have been unoccupied for a long time.
- Dead Space 3 is perhaps the most heinous offender. The Sovereign Colonies Galactic Expedition wiped itself out 200 years prior to the events of the game... But there is plenty of splattered blood around the place that's just slightly darker in color, rather than completely bleached or at least brown. Gets downright ridiculous in the pressurized, properly oxygenated environment of the derelict starships in orbit around Tau Volantis. Possibly justified with a bit of Fridge Logic: Late in the game you find a leaper that's been pinned to a wall, and a note near by that tells you that, even after you shoot them to pieces, the cells in a necromorph don't die, seemingly kept "alive" by the Marker Signal. If it's necromorph blood (and after two hundred years, it would be) then it couldn't degrade.
- In Dragon Age, blood never seems to dry. Maybe warriors clean their armor off frequently, but one would assume mages in cloth robes/light armour or rogues in light/medium leather armor would have some trouble getting all the stains off. Also, you just keep getting hosed off with more blood in every single fight. They just need to get enough off so all that's left will just blend in with everything else in the game.
- Uncharted: Drake's Fortune averts this trope properly; Drake comes across a beached U-Boat, whose crew were really torn up by something. Over the decades, all the blood on the surfaces and corpses has faded to a rusty brown that's not even recognizable as blood unless you know what to look for.
- Averted in some instances in Fallout 3. The town of Minefield is full of decayed corpses. However, as the player searchs for mines they might spot a trail of bright red blood leading to a house, with a bloody red palm print on the door. The fact that this blood is fresh is a clue that the player is about to be attacked by a sniper. Played completely straight in abandoned areas, such as Vault 87.
- Exaggerated/ Parodied in Super Meat Boy. The titular Meat Boy bleeds everywhere, leaving a bright red trail everywhere he runs and jumps. And yes, when you are inevitably shredded by the many, many buzzsaws, they stain red too. If you fall onto them repeatedly, they become bloodier and bloodier with each death.
- Averted in Professor Layton vs. Phoenix Wright: Ace Attorney, when a stain on a piece of evidence is called "blackish" (and indeed is just very dark) and Phoenix only realizes it's blood when the witness states she scratched her attacker's flesh when fighting with the item in question.
- Silent Hill plays with this trope, where sometimes you must question if the walls are covered in rust or dried blood... as well as the fact that some monsters bleed blood that looks almost brown.
- Example from The Legend of Zelda: Ocarina of Time. The bloodstains on the Shadow Temple's torture equipment look bright and fresh — although this could just be an apparition, what with it being inside a magic temple and all... Or, to up the ante on the Nightmare Fuel quotient of that place, it really could have been fresh... There is a timeline where Link was killed in his quest. And this is a magic room dedicated to torture. He could be hallucinating what's left of him from that timeline.
- True of every bloodstain ever appearing in the Phoenix Wright: Ace Attorney series. Or if not all, then at least most. This occasionally causes problems for one character, who can't distinguish between red and white.
- The protagonist of Eternal Knights wears what appears to be bright red war paint while in costume as her superhero alterego, Artemis. This "paint" is actually the blood of her dead lover, Étienne. Who died in 1014 AD.
- In Death By Cliche, a villain's carpet is described as "brown, not because it was a tasteful colour, but because eventually blood dried."
- Inverted in the Fewdio short horror piece, "Cleansed". The thicker pools of blood turn dark and sticky while the lighter stains darkened to brown.
- In Madgie, what did you do? XLVII: Myxoma, Madness, and The Beginning of World War III , Toki stains her white slip in blood (twice) and it still remains bloodstained throughout the rest of the story and she still remained covered in blood, apparently, while it had dried, it didn't seem have decomposed.
- Reality Is Unrealistic: The Heeresgeschichtliches Museum (Army History Museum) in Vienna houses in a display case the uniform that Archduke Franz Ferdinand was wearing when he was assassinated in Sarajevo in 1914. Complete with bloodstains, which have bleached white over the years. This is because of the light, as the color red fades over the years due exposure to sunlight.
- Bloodstains are often so similar to rust stains that it's impossible to distinguish them unless a proper chemical analysis is done. There were a lot of cases when they were confused for each other, including one during the original Mary Celeste trial. The prosecutor insisted that the brownish stains on a saber, found on a ship, were blood, until the judge ordered them to be analyzed, where they were proved to be just rust.