Dulux Royal Regatta 4 31BB 23/340

Contents

show +hide -

What are Dulux Royal Regatta 4 undertones?
Is Royal Regatta 4 31BB 23/340 cool or warm?
How light temperature affects on Royal Regatta 4
Monochromatic color scheme
Complementary color scheme
Color comparison and matching
Color codes
Color equivalents

Code:	31BB 23/340
Name:	Royal Regatta 4
Brand:	Dulux

What color is Dulux Royal Regatta 4?

Dulux Royal Regatta 4 31BB 23/340 is a clear mid-tone blue with a subtle cyan cast, based on its #3F87BC color value. It has a cool, fresh appearance without becoming overly dark, making it a strong option for a bedroom wall, bathroom cabinetry, or a painted front door. In bright daylight, Royal Regatta 4 reads as a clean blue, while warmer indoor lighting can soften its crispness slightly. Pair it with soft white trim, pale grey, light oak, or brushed nickel for a clean-lined look. For more contrast, use it alongside deep navy details or warm terracotta and rust-toned accessories.

Try before you buy

100% accurate
reusable paint samples

Peel, stick,
and repeat

Twice painted
with real paint

Next day
delivery

Shop now

What are Dulux Royal Regatta 4 undertones?

Royal Regatta 4 is a midtone, soft dusty blue. The HEX sample leans blue; this describes its measurable digital hue direction, not a hidden paint pigment. Warm bulbs may gray the color down, while cool daylight usually makes its blue or teal direction clearer.

HEX value:

#3F87BC

RGB code:

63, 135, 188

Is Dulux Royal Regatta 4 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.

Sunrise

Morning

Noon

Afternoon

Sunset

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 in Kelvins.
Use the slider to see how this Blue shade looks under different lighting:

2000K

3000K

4000K

5000K

6000K

7000K

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.

31BB 23/340
Royal Regatta 4

Compare
Dulux
Royal Regatta 4 31BB 23/340
to any other colors