What are Dulux Royal Regatta 4 undertones?
Royal Regatta 4 has a clear blue undertone based on its position in the color space. We identify undertones by isolating the pure hue (separating it from lightness and saturation), which avoids distortions caused by tints, tones, and shades.
This method is generally more reliable than judging undertones on a white background.
HEX value:
#3F87BC
RGB code:
63, 135, 188
Is Dulux Royal Regatta 4 31BB 23/340 cool or warm?
warm
cool
At 205° on the HSL hue wheel, this Blue falls clearly in the cool range.
31BB 23/340 Royal Regatta 4 HSL code: 205, 50%, 49%
Hue - degree on a color wheel from 0 to 360. 0 is red, 120 is green, and 240 is blue.
Saturation is expressed as a percentage. At 0%, it appears as a shade of grey, and at 100%, it is in full color.
Lightness is also a percentage value. 0% is black, and 100% is white.
How light temperature affects Royal Regatta 4
Natural Lighting. During the day, natural light shifts from about 2000 K at sunrise/sunset to 5500–6500 K at noon.
In addition, natural‑light temperature depends on its direction:
| Direction of sunlight | Visible temp. | Hue | Duration |
|---|---|---|---|
| North | Cool | Bluish | All day |
| East | Warm | Yellow | Before noon |
| West | Warm | Orange‑red | After noon |
| South | Warm | Orange‑yellow | All day |
Artificial Lighting. When choosing bulbs, pay attention to their color‑temperature (Kelvins).
Use the slider to see how this Blue shade looks under different lighting:
4000K
Coordinating colors.
Colors that go with Dulux Royal Regatta 4:
Monochromatic color scheme
This scheme consists of various shades, tints, and tones of a single color. While it offers a perfect combination of hues, without accent décor it may become monotonous.
Lighter shades
31BB 23/340
Royal Regatta 4
Darker shades
31BB 23/340
Royal Regatta 4
Complementary color scheme
This color scheme is a combination of two shades that are opposite each other on the color wheel. The high contrast between these colors creates a vibrant and dynamic visual effect. For the color Royal Regatta 4 with a green hue, complementary colors are those with a red hue close to 25, such as Dulux Cocoa Blush 5 and Chalk Blush 3.
Color codes
We have collected almost every possible color code you could ever need. To copy the code, just click the icon to the right of it.
| Format | Code | |
|---|---|---|
| HEX | #3F87BC |  |
| RGB Decimal | 63, 135, 188 | |
| RGB Percent | 24.71%, 52.94%, 73.73% | |
| HSV | Hue: 205° Saturation: 66.49% Value: 73.73% | |
| HSL | hsl(205, 50, 49) | |
| CMYK | Cyan: 66.49 Magenta: 28.19 Yellow: 0.0 Key: 26.27 | |
| YIQ | Y: 119.514 I: -59.936 Q: 1.263 | |
| XYZ | X: 19.787 Y: 22.013 Z: 50.77 | |
| CIE Lab | L:54.041 a:-5.567 b:-34.327 | |
| CIE Luv | L:54.041 u:-28.29 v:-51.922 | |
| Decimal | 4163516 | |
| Hunter Lab | 46.918, -6.828, -31.314 | |
Dulux 31BB 23/340 Royal Regatta 4
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Color equivalents
45BB 22/347
Blue Seduction 1
Dulux
27BB 21/366
Free Dive
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10BB 22/318
Venetian Crystal 4
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99BG 22/432
Azure Sky 1
Dulux
Sea Blue
Dulux
Electric Storm
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RAL 5012
Light blue
RAL Classic
RAL 5015
Sky blue
RAL Classic
30BB 27/236
Atlantic Surf 3
Dulux
237
Cook's Blue
Farrow and Ball
39BB 18/351
Royal Regatta 3
Dulux
206
Tivoli
Little Greene
Blueberry Icing
Dulux
99BG 26/393
Holiday Blues 1
Dulux
Azure Fusion 3
Dulux
25BB 32/310
Delicate Cornflower
Dulux
K431
Tikkurila
90BG 21/302
Celestial Blue 4
Dulux