HueTemperatureBias [fact] v1.0.0

Hue carries learned + biological associations: warm hues (red-orange, 0–60° / 300–360°) are associated with urgency, energy, and warning; cool hues (cyan-blue, 180–240°) with calm, trust, and stability — biases empirically replicated across cultures with cultural variance.

Warm hues in the OKLCH 0°–60° and 300°–360° ranges (reds, oranges, magentas) tend to read as urgent / energetic / alarming and are widely used for warnings and CTAs, while cool hues in the 180°–240° range (cyans, blues, indigos) tend to read as calm / stable / trustworthy and dominate financial / enterprise / governance UIs — these associations have biological roots (red = blood / fire / ripe-fruit signaling) and cultural reinforcement, with non-trivial cross-cultural variation.

Confidence

strong

Applies To

• brand-hue selection by domain (fintech / health / governance gravitate cool, food / fitness / urgency gravitate warm)
• status color choices (red-for-danger, green-for-success — note green-for-money is US-centric)
• marketing CTA color choice
• dashboard alert palettes

Quantitative

• Warm Hue Range Degrees: 0–60 and 300–360 (OKLCH H)
• Cool Hue Range Degrees: 180–240 (OKLCH H)
• Neutral Hue Range Degrees: 60–180 (greens, yellow-greens, cyans)

Counter Conditions

• Cultural variance: red signals luck / celebration in Chinese cultures, danger in Western; white signals mourning in some East Asian contexts.
• Hue association is a weak prior — it is overridden by saturation / lightness / context (a pale dusty-red reads as warm-elegant, a saturated red reads as alarm).
• Accessibility: never encode meaning by hue alone (color-blindness — see fact-color-blindness-types).

HueTemperatureBias [fact] v1.0.0

Hue carries learned + biological associations: warm hues (red-orange, 0–60° / 300–360°) are associated with urgency, energy, and warning; cool hues (cyan-blue, 180–240°) with calm, trust, and stability — biases empirically replicated across cultures with cultural variance.

Warm hues in the OKLCH 0°–60° and 300°–360° ranges (reds, oranges, magentas) tend to read as urgent / energetic / alarming and are widely used for warnings and CTAs, while cool hues in the 180°–240° range (cyans, blues, indigos) tend to read as calm / stable / trustworthy and dominate financial / enterprise / governance UIs — these associations have biological roots (red = blood / fire / ripe-fruit signaling) and cultural reinforcement, with non-trivial cross-cultural variation.

Confidence

strong

Applies To

• brand-hue selection by domain (fintech / health / governance gravitate cool, food / fitness / urgency gravitate warm)
• status color choices (red-for-danger, green-for-success — note green-for-money is US-centric)
• marketing CTA color choice
• dashboard alert palettes

Quantitative

• Warm Hue Range Degrees: 0–60 and 300–360 (OKLCH H)
• Cool Hue Range Degrees: 180–240 (OKLCH H)
• Neutral Hue Range Degrees: 60–180 (greens, yellow-greens, cyans)

Counter Conditions

• Cultural variance: red signals luck / celebration in Chinese cultures, danger in Western; white signals mourning in some East Asian contexts.
• Hue association is a weak prior — it is overridden by saturation / lightness / context (a pale dusty-red reads as warm-elegant, a saturated red reads as alarm).
• Accessibility: never encode meaning by hue alone (color-blindness — see fact-color-blindness-types).

Sources

Confidence

strong

Source

• Elliot & Maier, 'Color Psychology: Effects of Perceiving Color on Psychological Functioning in Humans', Annual Review of Psychology (2014)
• Labrecque, Patrick & Milne, 'Exciting red and competent blue: the importance of color in marketing', Journal of the Academy of Marketing Science (2012)
• Karen Schloss et al., 'An ecological framework for color preferences', Cognition (2011)

Applies To

• brand-hue selection by domain (fintech / health / governance gravitate cool, food / fitness / urgency gravitate warm)
• status color choices (red-for-danger, green-for-success — note green-for-money is US-centric)
• marketing CTA color choice
• dashboard alert palettes

Quantitative

• Warm Hue Range Degrees: 0–60 and 300–360 (OKLCH H)
• Cool Hue Range Degrees: 180–240 (OKLCH H)
• Neutral Hue Range Degrees: 60–180 (greens, yellow-greens, cyans)

Counter Conditions

• Cultural variance: red signals luck / celebration in Chinese cultures, danger in Western; white signals mourning in some East Asian contexts.
• Hue association is a weak prior — it is overridden by saturation / lightness / context (a pale dusty-red reads as warm-elegant, a saturated red reads as alarm).
• Accessibility: never encode meaning by hue alone (color-blindness — see fact-color-blindness-types).