Water Blue (RAL 5021)

RAL water blue, a blue-green like the surface of lakes and seas

HEX#2F737E

RGBrgb(47, 115, 126)

HSLhsl(188, 46%, 34%)

HSVhsv(188, 63%, 49%)

CMYKcmyk(63%, 9%, 0%, 51%)

HEXA#2F737EFF

RGBArgba(47, 115, 126, 1)

HSLAhsla(188, 46%, 34%, 1)

OKLCHoklch(72.9%, 0.063, 206)

LCHlch(69.3%, 27.5, 212)

🎨 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

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Aa14px Body

High Contrast Text

#FFFFFFRatio 5.4:1AA

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

Aa14px Body

Standard Text

#E5EBF5Ratio 4.5:1AA

Suitable for regular body content, meeting WCAG AA standards

Aa14px Body

Large Text / UI Components

#C2BCE6Ratio 3:1AA Large

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

Aa14px Body

Decorative / Dividers

#D080C6Ratio 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%

#0E2225

#133034

#193D43

#1E4B52

#245961

#296670

#2F747F

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

#476266

#43656B

#3E696F

#3B6B72

#376E77

#33717A

#2F747F

Lightness + Saturation Mixed VariationSimultaneous lightness and saturation proportional scaling

#161C1D

#1D292A

#223639

#274449

#2B535A

#2D646C

#2F747F

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

#2F7F75

#2F7F7C

#2F7B7F

#2F747F

#2F6D7F

#2F677F

#2F607F

💡 Use Cases

🧖

Premium Spas

Indoor pool mosaics at Nordic-style hot spring hotels—immersing the body as if floating in Finland's pure ice lakes.

🛏️

Wake-Up Lights

Philips natural wake-up lights' morning gradual-brightness color—simulating the dawn of a summer lake, painlessly starting the day from deep sleep.

🛁

Public Bathhouses

Zurich lakeside municipal baths—water-blue tiles continuing the Bauhaus functionalist philosophy of public health and bodily liberation.

💧

Water Bottle Design

Biodegradable water bottles and mineral water designs—using water-blue transparency to convey zero-contamination from springs deep beneath the ice.

📜 Origin & History

RAL 5021 Water Blue reproduces the distinctive color of the Baltic Sea and glacial meltwater lakes. In fjords and tarns shaped by Quaternary glaciation, suspended fine mineral particles absorb longer wavelengths, reflecting only this slightly greenish water blue into the eye.

In the late 19th to early 20th century, sanatorium medicine emerged in Europe. Swiss and German tuberculosis sanatoriums used water blue for solariums and bed linens—doctors believed this cooling blue-green helped reduce fever and cough, an early clinical application of color therapy.

During the Bauhaus movement, water blue was incorporated into modern architectural color composition. To break the coldness of white walls, masters like Gropius and Meyer laid water-blue tiles in worker housing and public baths, turning bathhouses into social vessels of utopian imagination.

Contemporary smart homes designate water blue as the default color for wake-up lights and meditation modes. Tech brands believe that the glacier-lake water-blue light slowly brightening at dawn best simulates the circadian rhythm of natural awakening, ushering in a stress-free new day.

🧠 Color Psychology

CrispLike alpine meltwater tarns—the extremely low temperature washing away turbidity, leaving only a wakeful breath of pure oxygen.

StillAs smooth as a rippleless lake—all mental wrinkles pressed flat by this cool blue-green, entering absolute calm hibernation.

MetabolicAccelerating the clearance of accumulated psychological toxins and fatigue—promoting emotional system metabolism like lymphatic massage.

InsightfulLike observing fish through crystalline water—it strips away confusing interference, exposing truth without reservation.

Slightly BrackishCarrying the distinctive taste of Baltic brackish water—representing the middle-ground wisdom of being neither purely lake nor purely sea.

RevivingThe first melting ice color after hibernation—宣告 the end of long nights and frozen ground, stirring the desire to root and sprout anew.

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