Behr Keystone Gray HDC-AC-21
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| Code: | HDC-AC-21 |
| Name: | Keystone Gray |
| Brand: | Behr |
What color is Behr Keystone Gray?
Behr Keystone Gray HDC-AC-21 is a light, muted gray with a noticeable but restrained green cast. Its low saturation keeps it from reading overtly colorful, giving walls a soft mineral look rather than a standard neutral gray. In daylight, the green undertone is more apparent, while warmer evening lighting can make the shade appear gentler and slightly more balanced. It suits bedrooms, bathrooms, and living areas where a pale gray needs more character than a purely cool tone. Pair Keystone Gray with warm white trim, pale oak, brushed nickel, charcoal accents, or matte black hardware for clear contrast.
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What are Behr Keystone Gray undertones?
Keystone Gray is a mid-light, very muted pale khaki. The HEX sample has a subtle yellow-green bias, but its low chroma turns that hue into a neutral-looking color rather than a clear yellow-green. Warm light can make it look more olive and earthy, while cool daylight usually makes the green direction easier to notice.
HEX value:
RGB code:
182, 187, 178
Is Behr Keystone Gray cool or warm?
warm
cool
With a hue of 93°, this Grey shade sits right in the neutral zone on the HSL color wheel—neither warm nor cool.
HDC-AC-21 Keystone Gray HSL code: 93, 6%, 72%
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 Keystone Gray
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 in Kelvins.
Use the slider to see how this Grey shade looks under different lighting:
4000K
Coordinating colors.
Colors that go with Behr Keystone Gray:
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
HDC-AC-21
Keystone Gray
Darker shades
HDC-AC-21
Keystone Gray
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 Keystone Gray with a yellow hue, complementary colors are those with a purple hue close to 273, such as Behr Mata Hari and Misty Lavender.
LRV of Keystone Gray
Keystone Gray has an LRV of 48.23% and refers to Light Medium colors that reflect half of the incident light. Why LRV is important?
Light Reflectance Value measures the amount of visible and usable light that reflects from a painted surface.
Simply put, the higher the LRV of a paint color, the brighter the room you will get.
The scale goes from 0% (absolute black, absorbing all light) to 100% (pure white, reflecting all light).
Act like a pro: When choosing paint with an LRV of 48.23%, pay attention to your bulbs' brightness. Light brightness is measured in lumens. The lower the paint's LRV, the higher lumen level you need. Every square foot of room needs at least 40 lumens. That means for a 200 ft2 living room you'll need about 8000 lumens of light – e.g., eight 1000 lm bulbs.
Color codes
We have collected almost every possible color code you could ever need.
Not sure what the difference between HEX and RGB is? We break down color models in plain language. Understanding color models
| Format | Code |
|---|---|
| HEX | #b6bbb2 |
| RGB Decimal | 182, 187, 178 |
| RGB Percent | 71.37%, 73.33%, 69.80% |
| HSV | Hue: 93° Saturation: 4.81% Value: 73.33% |
| HSL | hsl(93, 6, 72) |
| CMYK | Cyan: 2.67 Magenta: 0.0 Yellow: 4.81 Key: 26.67 |
| YIQ | Y: 184.479 I: -0.087 Q: -3.858 |
| XYZ | X: 45.096 Y: 48.7 Z: 49.132 |
| CIE Lab | L:75.264 a:-3.407 b:3.95 |
| CIE Luv | L:75.264 u:-2.355 v:6.392 |
| Decimal | 11975602 |
| Hunter Lab | 69.785, -6.777, 7.107 |
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