coaldark

Coaldark is a descriptive term used in color theory and design to refer to a deep, coal-like shade of black. It typically conveys solidity, seriousness, and formality, and is employed in art, interiors, and branding to anchor palettes with a non-reflective surface.

The term combines coal and dark and has appeared in design discourse since the late 20th century, with varying definitions across industries. In practice, coaldark denotes a spectrum rather than a fixed color.

Coaldark is characterized by very low lightness, cool undertones, and varying gloss depending on finish. In digital color spaces it is often approximated by deep near-black values and can shift under lighting toward blue-gray or greenish casts. Finishes range from matte to high gloss.

The shade is used for architectural accents, furniture, automotive finishes, and branding where a restrained, timeless look is desired. In UI and digital design, it provides strong contrast with lighter colors while avoiding the starkness of pure black.

Related terms include charcoal, jet black, and coal gray. The naming of deep blacks is not standardized, and "coaldark" may be used informally to describe any very dark shade with coal-like undertones.