Celtic is a
cool dark color with the hex code #1F3121.
Also known as
"Sweetgreen Deep Green"
by Sweetgreen
.
This muted hue can be represented as RGB
31, 49, 33 in digital design or CMYK 37%, 0%, 33%, 81% for print applications.
Find matching Pantone color.
Currently, 1 brand uses this color in their visual identity, making it a proven choice for professional branding and web design.
Celtic
#1F3121 aka “Sweetgreen Deep Green” by Sweetgreen
Celtic color values
- HEX
- #1F3121
- RGB
- 31, 49, 33
- HSL
- 127°, 23%, 16%
- CMYK
- 37, 0, 33, 81
Shades & tints
Darker Lighter
About this color
Celtic sits at 127° on the color wheel with 23% saturation and 16% lightness, placing it in the green segment of the spectrum. Its restrained 23% saturation keeps the hue subtle — present but not assertive, making it easy to layer over or under more expressive colors. The lower lightness gives it weight and depth, lending gravity to any palette it enters.
In digital environments, Celtic is rendered as rgb(31, 49, 33), where the green channel leads at 49, with red and blue channels close behind. Low saturation at this depth produces the kind of sophisticated, near-neutral dark that works for application shells, sidebars, and dark-mode base layers.
For print, Celtic translates to a CMYK breakdown of 37C 0M 33Y 81K. The dominant black channel (81%) does most of the tonal work here — cyan, magenta, and yellow contribute minimally, so the printed result will be a deep, near-neutral tone that reads differently from its screen equivalent. In brand applications, this exact value is specified as Sweetgreen Deep Green.
Color harmonies
Complementary
Analogous
Triadic
Split-Complementary
How to use Celtic
CSS Variable
:root {
--brand-primary: #1F3121;
--brand-primary-rgb: 31, 49, 33;
}Define as a CSS custom property for consistent theming across your site.
Tailwind Config
colors: {
brand: '#1F3121',
}
Add to your Tailwind config to use classes like bg-brand.
Print Design (CMYK)
C: 37%
M: 0%
Y: 33%
K: 81%Use these CMYK values in Adobe Illustrator, InDesign, or print specifications.
RGB for Screens
rgb(31, 49, 33)
rgba(31, 49, 33, 0.8)Use RGB notation for compatibility or add alpha channel for transparency.
Brands using Celtic
1 brand uses this color in their identity
Frequently asked questions
What color is #1F3121?
#1F3121 is Celtic, a cool dark color with RGB values of 31, 49, 33. It has a hue of 127°, 23%
saturation, and 16% lightness in the HSL color
space.
What is the RGB value of #1F3121?
The RGB color code for #1F3121 is rgb(31, 49, 33). This means it contains 31 red,
49 green, and 33 blue in the RGB color model.
Is Celtic a warm or cool color?
Celtic (#1F3121) is a cool color with a hue between 120-300° on the color wheel.
How do I use #1F3121 in CSS?
You can use #1F3121 in CSS with:
background-color: #1F3121; or color: #1F3121; or as an RGB value: rgb(31, 49, 33). For print design, use CMYK: 37%, 0%, 33%, 81%.