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Mine Shaft

#312D2A aka “Oracle Dark” by Oracle

Mine Shaft is a warm dark color with the hex code #312D2A. Also known as "Oracle Dark" by Oracle . This muted hue can be represented as RGB 49, 45, 42 in digital design or CMYK 0%, 8%, 14%, 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.

Mine Shaft color values

HEX
#312D2A
RGB
49, 45, 42
HSL
26°, 8%, 18%
CMYK
0, 8, 14, 81

Shades & tints

Darker Lighter

About this color

Mine Shaft sits at 26° on the color wheel with 8% saturation and 18% lightness, placing it in the orange-red segment of the spectrum. At near-zero saturation, it reads as a pure gray, with hue playing almost no role in its character. The lower lightness gives it weight and depth, lending gravity to any palette it enters.

In digital environments, Mine Shaft is rendered as rgb(49, 45, 42), where the red channel dominates at 49, though the other channels keep the hue balanced. 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, Mine Shaft translates to a CMYK breakdown of 0C 8M 14Y 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 Oracle Dark.

Color harmonies

Complementary

Split-Complementary

How to use Mine Shaft

CSS Variable 

:root {
  --brand-primary: #312D2A;
  --brand-primary-rgb: 49, 45, 42;
}

Define as a CSS custom property for consistent theming across your site.

Tailwind Config 

colors: {
  brand: '#312D2A',
}

Add to your Tailwind config to use classes like bg-brand.

Print Design (CMYK) 

C: 0%
M: 8%
Y: 14%
K: 81%

Use these CMYK values in Adobe Illustrator, InDesign, or print specifications.

RGB for Screens 

rgb(49, 45, 42)
rgba(49, 45, 42, 0.8)

Use RGB notation for compatibility or add alpha channel for transparency.

Brands using Mine Shaft

1 brand uses this color in their identity

Oracle

Technology • In-house Oracle

Frequently asked questions

What color is #312D2A?
#312D2A is Mine Shaft, a warm dark color with RGB values of 49, 45, 42. It has a hue of 26°, 8% saturation, and 18% lightness in the HSL color space.
What is the RGB value of #312D2A?
The RGB color code for #312D2A is rgb(49, 45, 42). This means it contains 49 red, 45 green, and 42 blue in the RGB color model.
Is Mine Shaft a warm or cool color?
Mine Shaft (#312D2A) is a warm color with a hue between 0-60° or 300-360° on the color wheel.
How do I use #312D2A in CSS?
You can use #312D2A in CSS with: background-color: #312D2A; or color: #312D2A; or as an RGB value: rgb(49, 45, 42). For print design, use CMYK: 0%, 8%, 14%, 81%.

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