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->''Losing him was blue like I'd never known''\\
''Missing him was dark grey all alone''\\
''Forgetting him was like trying to know somebody you've never met''\\
''But loving him was red''
-->-- '''Music/TaylorSwift''', "Red"

An emotion a character is experiencing can be identified by what colour the character, or whatever they have is or turns in to. A [[HighPressureEmotion character might turn red when they are angered or embarrassed]], yellow when happy, or blue when sad. The background might even change to the same colour the person is. Sometimes, a character will change clothes to reflect what they feeling that particular day. Someone with an AuraVision might be able to tell what mood another person is in by the colour their aura emits.

The trope is pretty old as the SevenDeadlySins originally had colors associated with them. Envy is green (yes, that's where the whole GreenEyedMonster idea came from), Lust is blue (in some languages, a porno is actually called a "blue film" and a horny person is said to have a "blue mind"), Pride is purple (the color of royalty), Wrath is red, Gluttony is yellow and Sloth is light blue.

Here's a list of colours commonly used to identify several emotions:
* Red: Anger, embarrassment, passionate, and lustful.
* Blue: Shyness, sadness, and calmness.
* Yellow: Cowardice, happiness, or caution.
* Green: Disgust, envy, sickness, friendly, or greedy.
* Grey: Depression and emotionless.
* Black: Cold or mournful.
* Pink: Cheery, embarrassed, and love.
* White: Sick, shocked, scared, cold, and mournful.

A subtrope of ColourCodedForYourConvenience. See also BlueWithShock, ColourFailure, HighPressureEmotion, and MoodRingEyes.

[[folder:Anime & Manga]]
* In ''Manga/AhMyGoddess'', Belldandy can see Keichi's moods as colored auras.
* Koro-sensei from ''Manga/AssassinationClassroom'' can change his skin color to show his emotions, since he is [[PerpetualSmiler almost always smiling]]. The list is:
** Yellow: His normal color.
** Yellow with green stripes: Mocking contempt.
** Orange with circle shape: Right answer.
** Purple with X shape: Wrong answer.
** Blue: [[BlueWithShock Shock]]/sadness.
** Magenta: Sleepy/relaxed.
** Pink: Blushing.
** White: Poker face/bewildered.
** Red: Angry.
** Pitch black: Extreme anger.
** [[spoiler: Blinding white glow: ''Pissed off beyond reason.'']]
* Due to the games showing him with barely any expressions, this had to be done for Meta Knight in ''Anime/KirbyOfTheStars'', by changing the colors of his eyes under his mask.
** Blue: Proud.
** Red: Angry.
** Green: Suspicious.
** Grass Green: Serious.
** Pink: Amused.
** Dark Yellow: "Closed" (This would be retconned in the following games)

* "Suicide - Blue", "Homicide - Red" and "Genocide - Yellow" from the ''Patchwork Horrorshow'' portfolio from [[Creator/AzaSmith Aza Smith's]] ''Website/GrindhouseAndWatercolorsTheRevulsionAndTerrorOfAzaSmith'' fit this criteria.
** "Suicide - Blue" shows depression, using blue as the color of tears.
** "Homicide - Red" shows rage, using the color of blood.
** "Genocide - Yellow" shows apathy, using the color of bile and poison.

[[folder:Comic Books]]
* The ''ComicBook/GreenLantern'' series has the Emotional Spectrum, which associates a specific color to an emotion, and these emotions are what power up the lantern rings. Red is Anger, Orange is Greed, Yellow is Fear, Green is Willpower, Blue is Hope, Indigo is Compassion, and Violet is Love. There is also White and Black, representing Life and Death itself.

[[folder:Fan Works]]
* Water elementals shift colour according to their mood in ''FanFic/DiariesOfAMadman''. Within the dream realm, dreams are also coloured according to the type of dream it is, and the emotions of the dreamer.
* ''Fanfic/{{Domoverse}}'': Caroline sees emotions this way.
** Dark Red: Murderous Rage
** Baby Blue: Safety
** Black: Hate
** Green: Happiness
** Dark Forest Green: Jealousy
** Orange: Fear
** Sunny Yellow: Playful/Happy
* ''Fanfic/WithThisRing'': The Emotional Spectrum, as originally from the ''ComicBook/GreenLantern''. Interestingly, the SI's thoughts and speech are often coloured Orange, and on occasion, the other colours of the spectrum. The Green Lanterns also demonstrate this, but so do other characters who feel particularly strong emotions.

[[folder: Film -- Animated]]
* ''Animation/TheMysteryOfTheThirdPlanet'' had an animal which changed color depending on emotion.
* Disney/Pixar's film ''WesternAnimation/InsideOut'' has the emotions be color-coded: Joy is yellow, Sadness is blue, Anger is red, Disgust is green, and Fear is purple.
* Disney/{{Tangled}}: Pascal the chameleon sometimes changes color on emotions, e.g. when he's startled and scared by Maximus suddenly dragging Flynn away, he turns red. This is downplayed however, because ''most'' of the color-changes he has in the movie, are [[HollywoodChameleon him matching colors with his environment, or even color-changing on will for fun]].
* ''WesternAnimation/{{Home}}'':
** The [[BizarreAlienBiology Boov change colors]] to reflect emotions. Red is anger, yellow is fear, orange is happiness, blue is sadness, and pink seems to be affection. In addition, [[CannotTellALie Oh]] has a bad habit of turning green (possibly with guilt) when he lies.

[[folder: Literature]]
* Drones in ''Literature/TheCulture'' often display a coloured force field to show what mood they're in: blue for formal, white for angry, red for pleasure and [[http://www.iainbanksfaq.co.uk/2008/12/what-are-various-emotion-colours-given.html so on.]]
* In ''Literature/TheWitchlands'', various Threads (lines representing feelings and connections of a person) have different colours to represent various emotions. Iseult, who can see Threads, often comments that she feels like she's living in the middle of a rainbow.
* The Idrian royals from ''Warbreaker'' have hair that changes colour depending on their emotions. Black for neutral, red for passion, embarrassment or anger, white for fear and golden-blonde for happy or content. They can control it to some extent, along with the length of their hair, which becomes a minor plot point when one of the princesses is trying to conceal her emotions.

[[folder: Music]]
* ''Music/BlueTrain'' by Music/JohnColtrane. The album cover is blue, just like the title and the title track. Coltrane is shown contemplating, suggesting he's feeling blue.
* ''Music/BlueJoniMitchellAlbum'' by Music/JoniMitchell has a blue colour for the same reason as the album example above.
* ''Colors'' by Music/{{Halsey}}, discussing the color gray, its relation with depression and how that all affects Matty Healy from The 1975.

[[folder: Tabletop Games]]
* ''TabletopGame/{{Warhammer}}'' and ''TabletopGame/Warhammer40000'': The four Chaos gods are the embodiments of a specific emotion felt by sentient creatures. Khorne (rage) is red, Tzeentch (hope) is blue, Slaanesh (desire) is either pink/purple, and Nurgle (despair) is green.
* In ''TabletopGame/MagicTheGathering'', this is used to [[SugarWiki/FunnyMoments hilarious]] effect in [[http://magiccards.info/eve/en/76.html Swirling Spriggan]]. Otherwise averted, however: emotions fall strictly under [[ColorCodedMagic Red]], though characters aligned with other colors obviously feel emotions.
* In the ''Literature/NewWorldOfDarkness'', characters with AuraVision can identify people's emotions by the colours in their auras.

[[folder: Video Games]]
* In ''VideoGame/Fallout2'' with the Empathy perk you see in blue what responses will get a calm reaction, red for anger, and the regular green for neutral.
* ''VideoGame/GoldenSun'' uses little emoticons to represent character's emotions. Red for angry, yellow for happy, and blue for sad.
* In ''VideoGame/StarWarsTheOldRepublic'', the Sith Warrior and Inquisitor, classes that draw their power from rage, glow red when using their 'recovery' move. Jedi doing an equivalent move glow golden or blue instead.
* In ''VideoGame/ZooTycoon'', your animals have colored emoticons appear over their head to indicate their mood at certain times.
* In ''VideoGame/SuperPrincessPeach'' her vibe powers are represented by colored hearts: Yellow for joy, green for calmness, red for rage and blue for sadness. On the same vein, enemies will be colored the corresponding color when they are affected by one of the vibes.
* Athena Cykes from ''Franchise/AceAttorney'' has Widget, a necklace computer that aids her in [[TheEmpath reading the emotions of others]] and [[ExpressiveAccessory defaults to her own emotions]]: red for anger, green for joy or happiness, yellow for shock or surprise, and blue for sadness or fear.

* In the second season of ''Webcomic/CaptainUfo'', Celeste wants to interrogate a comatose prisoner, so she enters his mind thanks to Dr. Marcuus' [[MindProbe machine]]. The environment is usually a white-ish void, but memories are colour-coded (given the situation, red or blue/violet for anger and sadness).
* In ''Webcomic/{{Superline}}'', [[spoiler:Erinís]] emotion manipulation powers allow her to create physical manifestations of emotional energy, and each emotion has a specific color. As a subset of this power, she also has MoodRingEyes that correspond to the same colors.

[[folder:Web Animation]]
* In ''WebAnimation/HanazukiFullOfTreasures'', this is applied to the Moonflowers, the Hemkas and the Treasure Trees: Red for feistiness, orange for wackiness, yellow for happiness, lime green for fear, dark green for mellowness, blue for sadness, light blue for glamor, purple for bravery, lavender for inspiration, pink for love, and black for despair.

[[folder:Web Original]]
* ''WebOriginal/AirRideAdventures'' has this in spades.

[[folder:Western Animation]]
* An episode of the ''WesternAnimation/{{Aladdin}}'' TV series had the characters enchanted by colored gemstones which instilled them with corresponding emotions--blue for depression, green for envy, yellow for fear, etc.
* An episode on ''WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius'', where Jimmy gets banned in the science fair, features a device that detects emotion through colour and music genre. For instance, when Cindy feels happy, the device shines yellow as it plays a sunny tune; when she spots Jimmy, the colour turns red as the music shifts to heavy metal; and while she feels regret and accidentally puts her hand on the device, it turns blue and plays, well, blues.
* ''WesternAnimation/KimPossible'': The Moodulator, a device that changes emotion, is coded by colour. E.g, yellow for happy, blue for sadness, pink for love, and red for rage.

[[folder:Real Life]]
* Many animals that are capable of changing the colors of their skin often do this to display their emotions to others of their species or to potential predators. For example, chameleons will become brighter when they're feeling excited or black when extremely agitated. Squids take this a step further by rapidly changing colors to display to potential mates, warn rivals or even disorient their prey.