Petroleum
Petroleum (#21211d) is a color defined by its deep, mysterious character. This rich, near-black shade offers a sophisticated alternative to stark black, bringing a subtle hint of green and blue to the darkest end of the spectrum. Its notable depth gives it a strong visual presence, making it a compelling choice for creating focal points and sophisticated accents in any interface.
Pairs well with
Analogous
Neighbours on the color wheel, producing a cohesive, low-tension pairing.
Complementary
Direct opposites on the wheel, for maximum contrast.
Split complementary
The two colors bordering the complement — contrast with less tension.
Triadic
Three colors equally spaced around the wheel, bold and balanced.
Tetradic
Two complementary pairs, forming a rich four-color set.
Square
Four colors evenly spaced for a balanced, high-contrast set.
Shades, tints & tones
Shades
Mixed with black — deeper, heavier.
Tints
Mixed with white — softer, less saturated.
Tones
Mixed with gray — muted, quieter.