Dulux Royal Regatta 4 31BB 23/340
| Code: | 31BB 23/340 |
| Name: | Royal Regatta 4 |
| Brand: | Dulux |
What color is Dulux Royal Regatta 4?
Let’s dive into a full Royal Regatta 4 paint color review. Take a look at pictures of real interiors and exteriors painted with beautiful 31BB 23/340. Find out if this gorgeous cold blue paint color would look great on your living room walls or trims, kitchen cabinet, bedroom accent wall, bathroom or house exterior.
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What are Dulux Royal Regatta 4 undertones?
The undertone of Royal Regatta 4 can be accurately described as a Blue hue, as is apparent from the color space provided. By isolating the pure hue and eliminating any tints, tones, and shades, we were able to precisely determine its undertone. This approach has proven to be more accurate than traditional methods of defining undertones on a white background, which are now considered outdated.
HEX value
HEX value:
#3F87BC
RGB code:
63, 135, 188
Is Dulux Royal Regatta 4 31BB 23/340 cool or warm?
With a hue of 205° thisBluerefers cool paint shade according to HSL (Hue, Saturation, Lightness) on the color wheel.
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.
- Cooler hues have a calm and relaxation effect
- Cool blue shades make a room feel sleek, fresh, and modern, perfect for bedrooms, bathrooms, and home offices where a sense of calm and sophistication is desired.
- Using mid-tone cool colors like soft greys and muted blues can help create a calming and modern look in rooms like home offices, bathrooms, and bedrooms. But avoid using these shades in rooms without natural light, as they may look dull.
Act like a pro: Mixing warm and cool shades is a must have to get harmonius interior. Add accents that contrast with the primary color to create visual balance. If your walls are a warm color, don’t forget to add accent in cold colors (furniture, art, décor). A good practice is too use a complementary color scheme.
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 |
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K431
Tikkurila


