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Chartreuse may be the single most reliably confusing color name in the English language. If you ask ten people what color chartreuse is, you will likely get a split between those who say it is a vivid yellow-green and those who insist — with equal confidence — that it is somewhere in the red, pink, or magenta spectrum. Both groups are certain they are correct. Only one group agrees with the CSS specification.

The Origin: A Monastery in the French Alps

The name chartreuse comes from the Grande Chartreuse monastery, nestled in the Chartreuse Mountains near Grenoble in southeastern France. The Carthusian monks of this monastery have been producing a distinctive herbal liqueur since at least 1737, following a formula allegedly given to them in 1605 by François Annibal d'Estrées — an 130-ingredient recipe that remains one of the most guarded trade secrets in the world.

The original Chartreuse liqueur is a bright, vivid yellow-green — the color of new spring foliage with a slightly electric intensity. It is unmistakably in the green-yellow family. When English speakers began borrowing the name for a color in the late 19th century, they were describing this liqueur and its distinctive hue.

A second variety, Red Chartreuse (Chartreuse Rouge), was produced for a period in the mid-20th century but was discontinued. This variety likely contributed to the confusion: people who encountered references to "Red Chartreuse" may have mentally associated the name "chartreuse" with red or pink hues.

What CSS Says: #7FFF00

The web specification is unambiguous. The CSS named color chartreuse is defined as:

• Hex: #7FFF00
• RGB: rgb(127, 255, 0)
• HSL: hsl(90, 100%, 50%)
• Description: A vivid, fully saturated yellow-green

This places chartreuse exactly halfway between pure yellow (#FFFF00) and pure green (#00FF00) on the hue spectrum, but leaning slightly more toward green. It is almost aggressively bright — not a color you would use for a background or as a neutral. In HSL terms, the hue of 90 degrees positions it at the midpoint of the yellow-to-green arc.

Compare it to its neighbors:

Chartreuse is one of the most saturated colors in the CSS named color set. Its RGB values — 127 red, 255 green, 0 blue — mean it is at maximum green intensity while also having a significant red component contributing warmth. It has zero blue at all.

You can use the Color Converter to explore chartreuse in all color models, including CMYK and OKLCH.

Why Do So Many People Think Chartreuse Is Red or Pink?

This is one of the most interesting cases of mass color misremembering, and researchers and color bloggers have speculated extensively about its causes.

The Red Chartreuse effect: As mentioned, a short-lived Red Chartreuse liqueur existed, and some people first encountered the name in that context. If your first exposure to the word "chartreuse" was through a red-tinted bottle or label, you may have formed an incorrect association that persists despite later evidence.

Linguistic isolation: Chartreuse is an uncommon word in everyday English. Many people learn it once, in passing, without ever seeing it paired with a concrete color swatch. When later asked to recall it, they are guessing from memory rather than from direct experience.

Interference from similar-sounding words: Some linguists suggest that "chartreuse" sounds vaguely like words associated with warmth or richness — "charred," "char," or even the French prefix "rouge" (red). This phonetic interference may push people toward red-spectrum associations.

Glamour and fashion associations: In the 1950s and 1960s, vivid pinks and reds were sometimes called exotic or European-sounding names in fashion contexts. Some consumers may have encountered "chartreuse" used loosely for a vivid pink, cementing the wrong association.

Whatever the cause, surveys consistently find that a significant minority of English speakers misidentify chartreuse. A widely cited 2014 informal survey found that roughly 30% of respondents associated the word with a red or pink color. Knowing this, the correct answer is still #7FFF00.

The Grande Chartreuse Monastery Today

The Grande Chartreuse is still an active Carthusian monastery — one of the strictest monastic orders in the Roman Catholic Church. The monks observe near-total silence, meet as a community only for certain liturgical services, and spend most of their time in individual hermitages within the monastery complex. Visitors are not permitted inside the monastery itself, though a museum nearby (La Correrie) explains the history.

The liqueur is still produced nearby at a distillery in Voiron, France — the Caves de la Chartreuse. Green Chartreuse (55% ABV) and Yellow Chartreuse (40% ABV, slightly sweeter) are the two main varieties in production today. The color of Green Chartreuse is the direct ancestor of the CSS named color; Yellow Chartreuse is a softer, slightly more golden hue.

The liqueur's ingredients include over 130 plant species — including herbs, flowers, and roots sourced from the Alps. Only three monks at any given time know the full recipe. The formula is stored under a legal seal and has not been published.

Using Chartreuse in Design

#7FFF00 is an extreme color by any measure. Its full saturation and yellow-green hue make it attention-grabbing but difficult to use in large areas or alongside delicate palettes. Here is how designers typically work with it.

Accent and Highlight Use

Chartreuse works well as an accent — a small pop of high-contrast color against dark backgrounds. Against deep navy #1B2A4A or near-black #111111, chartreuse reads as electrifying and modern. This combination appears frequently in tech, gaming, and fitness branding, where energy and intensity are desirable.

Against white #FFFFFF, chartreuse has a luminance that makes it hard to use for text — the contrast ratio between #7FFF00 and white is approximately 2.3:1, which fails WCAG AA requirements. Chartreuse text on a white background is not accessible.

Muted Variants

For more versatile design use, consider desaturated or darkened variants of chartreuse:

Use the Palette Generator to explore harmonious combinations built around the chartreuse hue, including complementary (the opposing color is in the blue-violet range) and analogous (neighbors in the yellow and green zones) schemes.

Complementary Pairing

The complement of chartreuse on the color wheel sits in the violet-blue range — around #8000FF to #9400D3. This pairing is vivid and maximally contrasting, suitable for attention-demanding contexts like sports team colors, festival branding, or gaming interfaces. It is not subtle.

For a softer split-complementary approach, pair chartreuse with blue #0000FF and violet #800080 to get a triad that is energetic but more balanced than the pure complement.

Key Takeaways

• Chartreuse is a vivid yellow-green, defined in CSS as #7FFF00 — rgb(127, 255, 0), at the 90-degree hue position between yellow (60°) and green (120°).
• The name comes from the Grande Chartreuse monastery in France, whose distinctive herbal liqueur is exactly this yellow-green color.
• A significant minority of English speakers misremember chartreuse as red or pink, likely due to a discontinued Red Chartreuse variety and the uncommon nature of the word.
• Pure CSS chartreuse is too saturated for most design applications at large scale — but it works powerfully as an accent color against dark backgrounds.
• Chartreuse text on white fails WCAG contrast (approximately 2.3:1 ratio) — avoid using it for body text on light backgrounds.
• Explore harmonious palettes built around chartreuse's hue using the Palette Generator, and convert it to CMYK or OKLCH with the Color Converter.