About Petroleum
At #21211d, Petroleum is a deep gray with a muted presence, nearest to charcoal. In color psychology it reads as modern, serious, and focused — a neutral presence, and it carries the steadiness designers lean on for trust-centered brands.
For text on Petroleum, white performs best at 16.15:1 — passing WCAG AAA. In a palette it suits background or primary roles.
Contrast Accessibility
With white
16.15:1
With black
1.30:1
Color Conversions
#21211d
rgb(33, 33, 29)
hsl(60°, 6%, 12%)
oklch(0.246 0.007 106.9)
cmyk(0%, 0%, 1200%, 8700%)
Tint & Shade Scale
A 10-step scale from light to dark, anchored to the base color at step 500. Click any swatch to copy its hex.
Tone Scale
Color mixed with gray — reduces saturation without changing lightness. Click any swatch to copy its hex.
Temperature
Hue shifted cooler and warmer in equal steps. Click any swatch to copy its hex.
Color Psychology
Adds: versatility, balance
A neutral, modern tone.
Common in dark mode; pairs well with vivid accents.
Learn more about color psychology →Palette Narrative
A thoughtfully curated palette evoking focused, modern, serious. Well-suited for minimalist and premium brand contexts. A focused selection that communicates intent clearly.
Inspired Palettes
Shades
Lightness variations keeping hue and chroma intact
Monochromatic
Single hue with varied lightness and chroma
Complementary
Opposite hues on the color wheel for maximum contrast
Triadic
Three evenly spaced hues for vibrant balance
Analogous
Neighboring hues for natural, serene combinations
Split Complementary
Complement split into two flanking hues
Generic Gradient
Smooth lightness ramp from dark to light
Matching Gradient
Lightness ramp with a gentle hue drift
Skip Gradient
Alternating light and dark steps for rhythm
9 of 28 palettes from #21211d
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#202020deltaE 0.0Attractive Black
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