In which a character touches a blood stain with his fingers, usually in order to make sure that it's blood.

Sometimes it [[ABloodyMess turns out to be ketchup or strawberry jam]], especially if another character has been doing a Chicken Little impersonation over the supposed bloodstain. In RealLife, it's possible that some animals (bloodhounds, brown bears, tyrannosaurs, larger sharks) may have a sufficiently powerful sense of smell, this (or simply sniffing the blood) might actually allow them to [[MysteriousAnimalSenses determine the species or even the individual victim involved]].

See also SniffSniffNom, FingertipDrugAnalysis. ''Not'' to be confused with [[Radio/APrairieHomeCompanion The Ketchup Advisory Board]][[labelnote:*]]Although those natural mellowing agents may account for the unscientific behavior...[[/labelnote]].
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!!Examples:

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[[folder: Anime and Manga ]]

* The title character of ''Manga/InuYasha'' is half-{{inugami}} and has the supernaturally sensitive and accurate canine sense of smell to show for it, with the result that he's frequently shown noticing the scent of blood over considerable distances, and can recognize when the blood belongs to someone he knows personally.

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[[folder: Comic Books ]]

* In a MarvelComics {{Dracula}} story set during World War II, Dracula identifies a bloodstain as "gypsy blood" this way. Well, he is a [[JustifiedTrope vampire]]... (Nazi troops were killing Roma. The Roma in Transylvania are protected by Dracula. Bad Move.)
* Lehrigen, a human from the ''Wild Hunt'' subseries of ''ElfQuest'', is an expert hunter and tracker, and can tell human and elfin blood apart by smell and/or taste.

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[[folder: Fanfiction ]]

* In ''The Keening Blade'' (''VideoGame/DragonAgeOrigins'') the slightly-mad Maude samples the bloodstains available in Warden's Keep:
-->"Walking dead and raspberry jam?" Maude complained. "There's raspberry jam on the votive candles! What kind of chapel is smeared with raspberry jam?"
-->"What kind of chapel is full of mindless zombies?" Loghain wondered, laying another one low.
-->"All chapels," Morrigan shot back. "And that looks like blood to me. How do you know it's raspberry jam?"
-->"I tasted it," the girl replied loftily, finishing off the last of the monsters. "It's not blood, it's raspberry jam. I checked."
-->Kicking a skeleton aside, Loghain snarled at her. "Didn't your parents ever teach you not to put strange red substances in your mouth?" He thought again. "Or any strange substances?"
-->"I know about mushrooms," she replied. "I'm not an idiot, you know."
** And there actually ''is'' an inexplicable jar of jam to be found in-game.
* In the prequel to ''Fanfic/DragonAgeTheCrownOfThorns'', the middle Aeducan child sends a red-soaked nug into a feast full of dwarven nobility. After mayhem ensues, the visiting King Maric tries some and announces it's cherry jam.

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[[folder: Film ]]

* Dumbledore in ''[[Film/HarryPotterAndTheHalfBloodPrince Half-Blood Prince]]''. "Dragon blood."
* Gimli tops it by tasting the orc blood in Peter Jackson's rendition of ''Film/TheLordOfTheRings''...which raises the question of how he even knows the difference to begin with...
* Played with in the "Thanksgiving" trailer in ''Film/{{Grindhouse}}'', when two small-town detectives are investigating a murder scene amid the titular holiday parade:
** Cop 1: (Touches, then tastes) "It's blood." Cop 2: "Son-of-a-bitch!"
*** It should be pointed out that by "investigating a murder scene" we mean, "The headless body is right there and the blood ''is still leaking out of it''".
* ''Film/StarTrekVITheUndiscoveredCountry'': Chekov finds a dried drop of something pink on the transporter pad, and pokes it before taking a sample. It's Klingon blood, which is what he was looking for.
** Repeated in the director's cut, with Colonel Worf investigating the pool of blood surrounding the attempted Klingon assassin.
--->'''Col. Worf:''' [[spoiler:[[LatexPerfection This is not]] [[CaptainObvious Klingon blood...]]]]
* Actually somewhat justified in ''{{Cornered}}'', since a lot of shelves were knocked over, and it could have very well been ketchup.
* The 2001 obscure Nickelodeon movie, "Snow Day", had the elementary students try to derail the snowplow man's efforts to remove the snow from the streets since it will reopen their snowed-in school. One of their less successful methods was having one of the students lie in the middle of the street in wait of the snowplow man with ketchup on his shirt pretending to be unconscious. Bemused, the snowplow man simply stands next to the boy, dipping his frenchfries in the ketchup and eating them.
* ''LoadedWeapon1'' has an example where it's ketchup, given it's a parody.
* This is how the [[Film/Terminator3RiseOfTheMachines T-X]] can determine the identity of her victims if there is ever any doubt. (DNA scanners in her tongue. Who'd have thought it?)

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[[folder: Literature ]]

* In Creator/RobertAHeinlein's ''Literature/ToSailBeyondTheSunset'', the protagonist [[BedmateReveal wakes up in a strange hotel room with a dead body in a pool of blood]]. After she phones for help, two doctors arrive. They each dip a finger in the "blood" and taste it. As she is feeling rather sickened, they begin arguing over whether it is Heinz or Skinners brand ketchup.
* In Chris Jericho's autobiography ''A Lion's Tale'', he describes a Ketchup Test incident that occurred during one of his early matches. Jericho bled a lot in this match and one of the ringside fans, believing Jericho's real blood to be ketchup, dipped his finger in a pool of Jericho's blood and put it in his mouth.

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[[folder: Live Action TV ]]

* [[Series/ChappellesShow Dave Chappelle]] explains that since semen is also a tool used by police to frame the black guy while doing their jobs, they might check that instead.
* Though it wasn't blood that he tested it with, Gil Grissom did this twice in ''{{CSI}}''. The first time, Brass merely stared in horror at him; the second, Catherine warned him how unsanitary it was.
* In an episode of ''{{Fringe}},'' the ketchup test is notably {{averted}}. The team finds a reddish stain on a piece of evidence left at a kidnapping scene, believing it at first to be blood, but they bag it and submit it for analysis only to discover that it is not blood but hot sauce.
** Walter has a recurring habit of tasting whatever disgusting thing they're dealing with and then revealing it's just some food he left lying around in the lab. He's done this with what appeared to be blood, brain matter, and cremated ashes. Taste is apparently the most important sense for scientists.
** Given that, the hot sauce example seems particularly notable, since it would be a perfect specimen for Walter's SniffSniffNom antics, since hot sauce generally has a distinctive odor.
* The Doctor does this in the ''Series/DoctorWho'' episode "The Christmas Invasion". He then tastes the blood and identifies it as "A-positive, with just a hint of iron" (Although his BizarreAlienBiology could let him do this).
* ''[[Series/TheXFiles The X-Files]]'', episode "Revelations": Mulder dabs his finger in "blood" and '''licks''' it. He promptly informs Scully that it has too much sugar.
* Inverted in ''Series/{{Community}}''. Britta sees a red stain on Jeff's shirt and is afraid it's [[PaintballEpisode paint]]. But with a relieved sigh he realizes that it's just blood.

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[[folder: Video Games ]]

* [[VideoGame/ResidentEvil1 I hope this is not Chris's blood...]]

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[[folder: Web Video ]]

* In {{WebVideo/Idiotsitter}}, during the episode "Fight Day", Gene surprises Billie in a dark garage, and paint cans fall on her. Hours later when Billie wakes up, she's got red all over her shirt and screams, before she realizes its paint.
-->'''Billie:''' Oh, its just paint.
-->'''[[DumbBlond Tansy]]:''' Well its about to be...not paint. [[DontExplainTheJoke Blood, is what I'm saying.]]

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