Image: Wikimedia Commons

red

Prismatic and primary color with longest visible wavelength in the electromagnetic spectrum

Entityprimary color web color HTML4 named colorQ3142

Also known as red color · color red

Instance of: primary color
, web color
, HTML4 named color
+2 more
Subclass of: color
Part of: seven prismatic colors

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

Red is the color at the long wavelength end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–750 nanometers. It is a primary color in the RGB color model and a secondary color in the CMYK color model, and is the complementary color of cyan. Reds range from the brilliant yellow-tinged scarlet and vermillion to bluish-red crimson, and vary in shade from the pale red pink to the dark red burgundy.

Overview

All data

78 statements · 19% with external sources · numbers in brackets are citations

SRGB color hex triplet: FF0000
ED0A3F criterion used: list of Crayola crayon colors
Short name: R criterion used: light characteristic · format as a regular expression: R
CSS color keyword: red start period: Cascading Style Sheets Level 1 Specification
Symbolizes: love
happiness valid in place: Sinosphere
martyrdom
revolution
Different from: Rot criterion used: descriptive page and disambiguation page have to be in different items · applies to name of subject: Rot
Rouge criterion used: descriptive page and disambiguation page have to be in different items · applies to name of subject: rouge
Red criterion used: instance of
Frequency: 429T Hz lower limit: 400 terahertz · upper limit: 484 terahertz
2
Sources
1.“Colour - Visible Spectrum, Wavelengths, Hues | Britannica”britannica.com/science/color/The-visible-spectrumRetrieved 2024-05-24
2.“Wavelengths and Colors of the Visible Spectrum”thoughtco.com/understand-the-visible-spectrum-608329Retrieved 2024-05-24
View statement on Wikidata ↗
Wavelength: 685.5 nm lower limit: 620 nm · upper limit: 750 nm · nature of statement: median
3
Sources
1.“Colour - Visible Spectrum, Wavelengths, Hues | Britannica”britannica.com/science/color/The-visible-spectrumRetrieved 2024-05-24
2.“Wavelengths and Colors of the Visible Spectrum”thoughtco.com/understand-the-visible-spectrum-608329Retrieved 2024-05-24
3.“Working in Wavelengths”chroma.com/support/knowledge-center/about-fluorescence/working-in-wavelengthsRetrieved 2024-05-27
View statement on Wikidata ↗
Followed by: orange
OpenStreetMap tag: colour=red
Follows: violet

On other databases

43 identifiers linking red across the web's reference databases

Data quality

statements

19%

externally sourced

Source last edited September 18, 2026. AIDB refreshes this page daily.

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AIDB. (2026). red (Q3142). Retrieved from https://aidb.si/e/red-Q3142