Dark Autumn (or Deep Autumn, Deep Fall) is the deepest, richest member of the Autumn family. Where Warm Autumn is harvest-warm and Soft Autumn is dusty-warm, Dark Autumn is mahogany, espresso, oxblood. The twelve hex codes above are the anchor points. The rules below explain the system.
What makes a colour Dark Autumn
Three traits converge.
Warm undertone. Pigments lean toward yellow, golden, copper, or warm earthy red. The warmth is slightly less dominant than in Warm Autumn — at this depth, the boundary with Dark Winter starts to soften. Cool icy tones are still excluded.
Dark value, dominant trait. The palette sits in the lower third of the lightness scale. Most pieces fall between 15 and 45 per cent lightness against pure black. Dark Autumn is the deepest seasonal palette aside from the Winter family.
Medium chroma. Saturation runs in the middle range. Richer and clearer than Soft Autumn, less bright than Bright Winter or True Spring.
Lose the depth and you slip into Warm Autumn. Lose the warmth and you move into Dark Winter. The chroma boundary is narrow — too high and the palette pulls toward Spring or Winter, too low and it drifts toward Soft Autumn.
Dark Autumn versus its neighbours
- Warm Autumn is one step lighter. Same warmth and chroma, lighter value. If Dark Autumn colours feel oppressively heavy, Warm Autumn is the better fit.
- Dark Winter is the cool counterpart. Same depth, opposite undertone. The drape test against burgundy with warm undertones (Dark Autumn) versus burgundy with cool undertones (Dark Winter) settles it.
- Soft Autumn is much lighter and softer. The same warmth runs through both, but the value and chroma are radically different.
The Dark Autumn / Dark Winter confusion is common because both palettes share depth. The undertone is the deciding factor — Dark Autumn requires the warmth to flatter the skin.
How to use these hex codes
The twelve codes split into four practical groups.
Reds, oranges, and burgundies. Oxblood #6E2818 is the everyday wardrobe red. Burgundy #5E2030 is the cool-leaning deep red. Cognac #784028 is the warmer mid-tone. Wine #482018 is the deepest red. Pumpkin #B05828 is the only orange accent.
Greens. Forest green #1E4838 is the everyday green. Dark olive #443818 is the deeper warm green-brown. Deep teal #1E484E sits at the boundary with the cool palettes.
Yellows and metallics. Mustard gold #A07820 is the only lifted yellow in the palette — the brightest piece. Bronze #784018 is the metallic anchor.
Neutrals. Espresso #2A1810 is the darkest neutral, replacing black. Deep brown #4A2818 is the mid neutral. Pair with a warm off-white or cream surface for designs that need a light neutral.
Hex math behind the palette
Three programmatic conditions.
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HSL hue in 0-60 (warm reds, oranges, yellows), with extensions to 100-200 only at low lightness for deep greens and teals. Pure cool blues and violets are excluded except at the deepest tones where Deep teal touches the boundary.
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HSL lightness between 10 and 40 per cent. Dark value is the dominant trait. Anything lighter pulls toward Warm Autumn.
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HSL saturation between 30 and 60 per cent. Medium chroma. Below 30 the palette becomes too murky; above 60 it pulls toward Bright Winter.
The colour finder shows HSL for any hex.
How to know if you are Dark Autumn
Daylight diagnostic checks.
- Espresso and deep brown feel like home; pure black is slightly stark.
- Pure white blouses make you look pale; warm cream looks balanced.
- Pastels overwhelm the face; deep saturated colours look natural.
- Yellow gold and bronze jewellery flatters; silver looks cold.
- Veins read green, olive, or warm.
- Hair is deep — dark warm brown, chestnut, deep auburn, black with warm undertones.
- Eyes are deep and warm — dark brown, deep hazel, warm dark green.
- Skin has natural depth and warm undertone.
If five or more match, Dark Autumn is a strong call. The drape test against Warm Autumn (lighter), Dark Winter (cooler), and Soft Autumn (much lighter and softer) confirms the season.
Dark Autumn in brand and product work
The palette is the strongest seasonal fit for luxury, heritage, premium-craft, and editorial brands. It signals depth, warmth, and grounded value.
Body text on warm cream with Espresso #2A1810 gives 14.5:1, the highest contrast ratio in any seasonal palette. Oxblood #6E2818 against cream gives 8.1:1, easily passing for any text size. Forest green #1E4838 against cream gives 9.6:1, also easy.
The pattern for a Dark Autumn brand is rich and high-contrast: cream or warm white surface, Espresso body text, Oxblood or Forest green as the hero, and Mustard gold or Bronze for accents. See the accessibility article for full luminance maths.
Building a Dark Autumn wardrobe
Five anchors carry the system. An Espresso coat. Cognac trousers. A Forest green knit. An Oxblood blouse. A Burgundy dress.
The palette is internally coherent through depth and warmth. Every piece coordinates with every other piece because the underlying three-trait signature is consistent. Add accent pieces in pumpkin, mustard, and deep teal to expand without breaking the system.