Indigo Blue

Web-standard indigo blue, a deep blue with greenish-black undertones

HEX#00416A

RGBrgb(0, 65, 106)

HSLhsl(203, 100%, 21%)

HSVhsv(203, 100%, 42%)

CMYKcmyk(100%, 39%, 0%, 58%)

HEXA#00416AFF

RGBArgba(0, 65, 106, 1)

HSLAhsla(203, 100%, 21%, 1)

OKLCHoklch(58.9%, 0.11, 223)

LCHlch(53.2%, 38.9, 233)

🎨 Color Palettes

Analogous2-3 adjacent hues (≤60°)

Triadic3 hues spaced 120° apart

Split ComplementaryMain color + colors adjacent to its complement

Complementary2 hues spaced 180° apart

Tetradic (Rectangle)4 hues forming a rectangle

MonochromaticSingle hue with varying saturation and lightness

♿ WCAG Contrast Colors

Learn More →

Aa14px Body

High Contrast Text

#99D8FFRatio 6.9:1AA

Suitable for body text, headings, and primary content, ensuring readability for all users

Aa14px Body

Standard Text

#94A0FFRatio 4.4:1AA Large

Suitable for regular body content, meeting WCAG AA standards

Aa14px Body

Large Text / UI Components

#A166FFRatio 3:1AA Large

Suitable for large text (≥18px bold or ≥24px), icons, UI component boundaries

Aa14px Body

Decorative / Dividers

#CC007ERatio 2:1Fail

Suitable for decorative elements, dividers, non-essential text

📊 Color Scales

Online Color Picker → Gradient Generator →

Lightness VariationFixed hue and saturation, proportional lightness scaling 30%→100%

#00131F

#001C2E

#002338

#002C47

#003252

#003C61

#00426B

Saturation VariationFixed hue and lightness, proportional saturation scaling 40%→100%

#203B4B

#1B3C50

#153D56

#103E5B

#0B4060

#054166

#00426B

Lightness + Saturation Mixed VariationSimultaneous lightness and saturation proportional scaling

#0B1014

#0D1921

#0D202B

#0C293B

#093048

#063A5B

#00426B

Hue Fine-TuningFixed saturation and lightness, stepwise hue fine-tuning ±15°

#005D6B

#00546B

#004B6B

#00426B

#00396B

#00306B

#00276B

💡 Use Cases

👖

Denim Products

Beyond jeans, various work jackets and bags gain a casual yet refined vintage soul through indigo.

🏺

Wabi-Sabi Textiles

Traditional indigo-dyed noren curtains or tea cloths, with texture changes recording the passage of time, adorning wabi-sabi spaces.

📝

Notebooks

Paired with cream-colored paper for recording important notes and maxims, organizing thoughts and deepening rational impressions.

🎵

Blues Bars

Paired with warm amber lighting, creating the classic palette of blues music venues, perfectly catalyzing melancholy and heartfelt atmosphere.

📜 Origin & History

Indigo is one of humanity's oldest dyes, derived from plants such as indigofera and polygonum tinctorium. The Indus Valley civilization mastered fermentation-based indigo production four thousand years ago, exporting large quantities to ancient Egypt and Mesopotamia. The Romans called it 'the pigment from India.'

In Japan, indigo dyeing reached its peak during the Edo period. Due to sumptuary laws restricting silk for samurai and commoners, cotton fabrics with complex indigo shibori patterns flourished, known as 'Japan Blue.' Hokusai's famous blue waves feature this color prominently.

In the late 19th century, German chemist Adolf von Baeyer successfully synthesized artificial indigo, dealing a severe blow to colonial plantation economies but also bringing indigo jeans to the global working class. Levi's 501, dyed with indigo, launched a century of workwear fashion.

In digital color standards, indigo blue is defined as a deep blue-black. It inherits the质朴 feel of traditional hand-dyeing while possessing digital depth, often used as a dark focal point in design to harmonize warm-cool contrasts.

🧠 Color Psychology

ProfoundAccumulating millennia of civilizational weight, like looking into a bottomless ancient well, evoking historical depth.

EarthyCarrying the fingerprints of craft and nature, stripped of industrial gloss, retaining the honest warmth of artisans' hands.

LogicalA strong sense of order, representing the清醒 side of rigorous reasoning and冷静 judgment.

ProtectiveLike dark armor, shielding and isolating from external chaos, steadfastly guarding inner beliefs.

InnovativeIts evolution from natural to synthetic materials embodies transformative power that challenges tradition.

TensileHolding tension between the deepest calm and the most explosive energy—like still waters that run deep.

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