RAL 150 20 15
Deep Indigo
RAL 150 20 15 Deep Indigo sits at hue 150, lightness 20, and chroma 15 in the RAL Design system, producing a very dark muted deep blue that evokes the solemn depth of indigo dye vats and starless winter skies. This restrained tone is favoured for observatory interior finishes, formal reception panelling, and ceremonial signage details. Its low lightness and moderate chroma create a colour that reads nearly black in shadow yet reveals a rich indigo undertone under direct light.
Color Reference
The RAL Design system uses Hue-Lightness-Chroma (HLC) notation. Hue describes the color family (0-360°), Lightness describes brightness (0-100), and Chroma describes saturation intensity (0-100+).
WCAG 2.1 AA requires 4.5:1 contrast for normal text. Results show this color as a background.
Spectrum & Perceptual Position
CIELAB is a perceptually uniform color space. Euclidean distance between two colors in this diagram closely matches human visual difference. The dot size shows your selected color; slightly larger dots are the nearest perceptual neighbors.
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Reference + opposite hue with tonal variations
Contrast ratios follow WCAG 2.1 guidelines. Green (≥4.5:1) passes AA for normal text. Amber (≥3:1) passes for large text only. Grey indicates low contrast.
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