International Klein Blue

HEX #1F18C0 / RGB (31, 24, 192)

Blue Colored Star Shape Illustration

What is International Klein Blue Color?

International Klein Blue (Hex code: 1F18C0) Thumbnail

International Klein Blue has the hex code #1F18C0. The equivalent RGB values are (31, 24, 192), which means it is composed of 13% red, 10% green and 78% blue. The CMYK color codes, used in printers, are C:84 M:88 Y:0 K:25. In the HSV/HSB scale, International Klein Blue has a hue of 243°, 88% saturation and a brightness value of 75%.
Details of other color codes including equivalent web safe and HTML & CSS colors are given in the table below. Also listed are the closest Pantone® (PMS) and RAL colors.

This deep hue of blue was created by the French artist Yves Klein who also tried to register the paint formula. It was developed with the help of the Klein's paint supplier, Edouard Adam, of Paris. The color is quite popular, for instance, being used by the Blue Man group and has songs and even a music band named after it.

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International Klein Blue Color Codes

Hex Code#1F18C0
RGB Values(31, 24, 192)
CMYK Values(84%, 88%, 0%, 25%)
HSV/HSB Values(243°, 88%, 75%)
Closest Web Safe#3300CC
Inverse Color#E0E73F [Maximum Green Yellow]
Closest Pantone®2736 C
Closest RAL5002 [Ultramarine blue]
Complementary Color#B9C018 [Acid Green]
International Klein Blue Converted to Grayscale Codes
Simple Average#525252
Weighted Average (Most Common)#2D2D2D
Weighted Average (Luma)#262626
Weighted Average (Gamma Adjusted)#676767

International Klein Blue Color Palettes

Complementary color palette of 1F18C0. Complementary color is B9C018

Complementary Palette

The complement of International Klein Blue is Acid Green with the hex code #B9C018. Complementary colors are those found at the opposite ends of the color wheel. Thus, as per the RGB system, the best contrast to #1F18C0 color is offered by #B9C018. The complementary color palette is easiest to use and work with. Studies have shown that contrasting color palette is the best way to grab a viewer's attention.

Analogous color palette with (1F18C0, 7318C0 and 1865C0)

Analogous Palette

The analogous colors of International Klein Blue (#1F18C0) are French Violet (#7318C0) and Denim (#1865C0). In the RGB color wheel, these two analogous colors occur to the right and left of International Klein Blue with a 30° separation on either side. An analogous color palette is extremely soothing to the eyes and works wonders if your main color is soft or pastel.

Split Complementary color palette with (1F18C0, C07318 and 65C018)

Split-Complementary Palette

As per the RGB color wheel, the split-complementary colors of International Klein Blue (#1F18C0) are #C07318 (Ochre) and #65C018 (Kelly Green). A split-complementary color palette consists of the main color along with those on either side (30°) of the complementary color. Based on our research, usage of split-complementary palettes is on the rise online, especially in graphics and web sites designs. It may be because it is not as contrasting as the complementary color palette and, hence, results in a combination which is pleasant to the eyes.

Triadic color palette with (1F18C0, C01F18 and 18C01F)

Triadic Palette

International Klein Blue triadic color palette has three colors each of which is separated by 120° in the RGB wheel. Thus, #C01F18 (Carnelian) and #18C01F (Yellow-Green (Color Wheel)) along with #1F18C0 create a stunning and beautiful triadic palette with the maximum variation in hue and, therefore, offering the best possible contrast when taken together.

Tetradic color palette with (1F18C0, C01F18, B9C018 and 18B9C0)

Tetradic Palette

The tetradic palette of International Klein Blue has four colors - #C01F18 (Carnelian), #B9C018 (Acid Green) and #18B9C0 (Tiffany Blue) in addition to the base color (#1F18C0). A tetradic color palette is complex and, in most cases, should not be used off-the-shelf. We suggest tweaking the colors slightly to achieve desired results.

Square color palette with (1F18C0, C01865, B9C018 and 18C073)

Square Palette

International Klein Blue square color palette has #C01865 (Rose Red), #B9C018 (Acid Green) and #18C073 (Green (Crayola)). Quite like triadic, the hues in a square palette are at the maximum distance from each other, which is 90°.
Note: For several colors purposes, a square palette may look much better than the tetrad color palette.

Rainbow color

International Klein Blue Color Rainbow Palette

Our International Klein Blue rainbow color palette is based on the RGB model and consists of 7 colors, just like the traditional rainbow. You might not see a lot of variation in color, especially if the chosen color is dark or extremely light. However, this can lead interesting rainbow palettes that are faded, soft, pastel or dull.

Tints, Tones & Shades of International Klein Blue Color


  • Transparent 4C46CD#4C46CD
  • Transparent 625DD3#625DD3
  • Transparent 7974D9#7974D9
  • Transparent 8F8CE0#8F8CE0
  • Transparent A5A3E6#A5A3E6
  • Transparent BCBAEC#BCBAEC
  • Transparent D2D1F2#D2D1F2
  • Transparent E9E8F9#E9E8F9


  • Transparent 322DB3#322DB3
  • Transparent 3C37AD#3C37AD
  • Transparent 4642A6#4642A6
  • Transparent 504CA0#504CA0
  • Transparent 59569A#59569A
  • Transparent 636193#636193
  • Transparent 6D6B8D#6D6B8D
  • Transparent 767686#767686


  • Transparent 19139A#19139A
  • Transparent 161186#161186
  • Transparent 130E73#130E73
  • Transparent 100C60#100C60
  • Transparent 0C0A4D#0C0A4D
  • Transparent 09073A#09073A
  • Transparent 060526#060526
  • Transparent 030213#030213

International Klein Blue Color Patterns

  • Transparent

    International Klein Blue Gingham Checks

  • Transparent

    International Klein Blue Vertical Stripes Pattern

  • Transparent

    International Klein Blue Polka Dots Pattern

  • Transparent

    International Klein Blue Honeycomb Pattern

  • Transparent

    International Klein Blue Leaves Pattern

  • Transparent

    International Klein Blue Houndstooth Pattern

  • Transparent

    International Klein Blue Trellis Pattern

  • Transparent

    International Klein Blue Plaid Pattern

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