Indigo Blue

Deep blue fermented from indigo plants, the true color of folk dyeing

HEX#1E4478

RGBrgb(30, 68, 120)

HSLhsl(215, 60%, 29%)

HSVhsv(215, 75%, 47%)

CMYKcmyk(75%, 43%, 0%, 53%)

HEXA#1E4478FF

RGBArgba(30, 68, 120, 1)

HSLAhsla(215, 60%, 29%, 1)

OKLCHoklch(62.8%, 0.08, 247)

LCHlch(57%, 32.1, 254)

🎨 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

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Aa14px Body

High Contrast Text

#CADBF2Ratio 6.9:1AA

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

Aa14px Body

Standard Text

#AFA9EARatio 4.5:1AA

Suitable for regular body content, meeting WCAG AA standards

Aa14px Body

Large Text / UI Components

#B174DCRatio 3:1AA Large

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

Aa14px Body

Decorative / Dividers

#CC3373Ratio 2:1Fail

Suitable for decorative elements, dividers, non-essential text

📊 Color Scales

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Lightness VariationFixed hue and saturation, stepwise lightness adjustment ±30%

#0A1729

#132C4E

#1E4376

#285A9F

#3270C8

#588CD5

Saturation VariationFixed hue and lightness, stepwise saturation adjustment ±30%

#344660

#2C4568

#25446F

#1E4376

#16417E

#0F4085

#073F8D

Lightness + Saturation Mixed VariationSimultaneous lightness and saturation adjustment

#172436

#152338

#182F4E

#1E4071

#215297

#2263BF

#2875E2

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

#1E5976

#1E5176

#1E4A76

#1E4376

#1E3B76

#1E3476

#1E2C76

💡 Use Cases

👘

Indigo-Dyed Apparel

Hand-dyed indigo cotton and linen robes; the fading process records the wearer's life traces, making it the top choice for slow fashion returning to simplicity.

🏺

Blue Printed Cloth

Used for table runners, cushions, and bedding. The traditional blue-and-white patterns add rustic warmth to guesthouses and tea spaces.

🎨

Workshop Experience

Experience projects in indigo dyeing workshops, allowing urbanites to hand-dye fabrics and feel the connection between traditional craft and nature.

📦

Packaging Design

The natural indigo color sense is used in packaging for organic food or handmade brands, conveying sincerity in pure natural ingredients and artisan craftsmanship.

📜 Origin & History

Indigo Blue has a history of over three thousand years of use in China. The 'Book of Songs' already records 'gathering indigo all day.' In the pre-Qin era, ancestors mastered the technique of extracting indigo paste from plants like Polygonum indigo and Strobilanthes, using it to dye silk and linen fabrics.

The Northern Wei Dynasty's 'Essential Techniques for the Welfare of the People' details the indigo fermentation process: soaking indigo plants to ferment, adding lime and stirring to produce indigo flowers, which then settle into indigo paste. This biological reduction dyeing method was highly ingenious, requiring experienced artisans to control temperature and alkalinity.

During the Ming and Qing Dynasties, blue printed cloth became popular throughout the country. Artisans scraped dye-resistant paste onto hollow paper stencils, dipped the fabric in indigo, and removed the paste to reveal blue and white patterns. This simple yet enduring blue-and-white printed cloth became the main color for ordinary people's clothing and bedding.

Indigo was not just a commoner's color; it also entered the court. The blue series of Qing Dynasty official uniforms was mostly dyed by repeated indigo immersion. By controlling the number of dips, different shades like Moon White, Sky Blue, and Deep Blue were achieved, forming a complete blue hierarchy system.

Today, Indigo Blue is experiencing a worldwide revival as a natural dye. The intangible cultural heritage techniques of China's Miao ethnic group's batik and Yunnan's Bai ethnic group's tie-dye still use indigo as their core medium. Its practical antibacterial and insect-repellent functions, along with its aesthetic value of returning to simplicity, make it a darling of sustainable fashion.

🧠 Color Psychology

Simple and GroundedA deep blue derived from the earth and plants, not flashy or dazzling, bringing the most authentic sense of security and the texture of real life.

Enduring and ResilientThe thousand-year colorfast dyeing property symbolizes permanence and loyalty, giving one the strength to be persistent and fearless against the elements.

Calm and VisionaryA deep but not oppressive blue, like the night sky, soothes the mind, helping to eliminate distractions and focus on the present.

Nostalgic WarmthThe rustic memories carried by blue printed cloth evoke tender feelings for hometown smoke and the warm embrace of elders.

Eco-ConsciousnessThe purity of natural plant dye awakens reverence and a protective heart for nature, advocating a sustainable lifestyle attitude.

Diligent and UnpretentiousA color closely related to working people, embodying the traditional virtues of diligence, pragmatism, and rejection of luxury.

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