Darkslategray4
darkslategray4 · #528B8B
HEX
#528B8B
RGB
rgb(82, 139, 139)
CMYK
cmyk(41%, 0%, 0%, 45%)
HSL
hsl(180, 26%, 43%)
LAB
lab(54.2, -18.6, -5.9)
What is Darkslategray4?
Darkslategray4 is the darkslategray4 reference in the X11 named colors. Its sRGB value is #528B8B (rgb 82, 139, 139). It sits in the cyan family. Historical X Window System color names — the numbered 1-4 lightness variants of the classic xorg-server rgb.txt palette. See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Darkslategray4 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Darkslategray4
An 11-step tonal scale derived from Darkslategray4 (#528B8B). Click any swatch to copy its HEX. Use these as a starting point for design tokens, hover states, and disabled states in a design system.
50
#F1F6F6
#F1F6F6
100
#E3ECEC
#E3ECEC
200
#C8DADA
#C8DADA
300
#A9C5C5
#A9C5C5
400
#7DA8A8
#7DA8A8
500
#528B8B
#528B8B
600
#467676
#467676
700
#355A5A
#355A5A
800
#253F3F
#253F3F
900
#152323
#152323
950
#0A1111
#0A1111
Lighter tints (mixed with white)
15%
#82A4A4
30%
#A2B8B8
45%
#BBCACA
60%
#D0DADA
75%
#E3E9E9
Darker shades (mixed with black)
15%
#4C8181
30%
#457676
45%
#3D6969
60%
#345A5A
75%
#284848
Color harmonies for Darkslategray4
Classic color-theory harmonies derived from rotating the hue of Darkslategray4. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#528B8B
#528B8B
#8A5151
#8A5151
Triadic
Three colors 120° apart
#528B8B
#528B8B
#8A518A
#8A518A
#8A8A51
#8A8A51
Analogous
Two neighbors ±30° on the wheel
#518A6E
#518A6E
#528B8B
#528B8B
#516E8A
#516E8A
Split-complementary
Base + two colors flanking its complement
#528B8B
#528B8B
#8A516E
#8A516E
#8A6E51
#8A6E51
Tetradic
Two complementary pairs
#528B8B
#528B8B
#51518A
#51518A
#8A5151
#8A5151
#8A8A51
#8A8A51
Square
Four colors evenly spaced 90° apart
#528B8B
#528B8B
#6E518A
#6E518A
#8A5151
#8A5151
#6E8A51
#6E8A51
Darkslategray4 in every color space
Full conversion of Darkslategray4 across the color spaces designers and developers actually use — including OKLCH (the perceptually-uniform space that powers Tailwind v4 and CSS Color Module Level 4) and HWB.
HEX
#528B8B
RGB
rgb(82, 139, 139)
CMYK
cmyk(41%, 0%, 0%, 45%)
HSL
hsl(180, 26%, 43%)
HSV
hsv(180, 41%, 55%)
HWB
hwb(180 32% 45%)
CIE Lab
lab(54.2 -18.6 -5.9)
OKLCH
oklch(59.8% 0.060 195.7)
XYZ (D65)
xyz(17.37, 22.12, 27.78)
Copy-ready code for Darkslategray4
Drop-in snippets for CSS, Tailwind, Sass, iOS Swift, and Android XML. Click the copy button on any snippet to put it on your clipboard.
CSS
color: #528B8B;
background-color: #528B8B;CSS variable
:root {
--color-darkslategray4: #528B8B;
}Tailwind config
// tailwind.config.js
colors: {
'darkslategray4': '#528B8B',
}Sass
$color-darkslategray4: #528B8B;Swift UIColor
UIColor(red: 0.322, green: 0.545, blue: 0.545, alpha: 1.0)Android XML
<color name="darkslategray4">#528B8B</color>Closest match in every color system
The nearest Darkslategray4 equivalent in every other color system on this site, ranked by ΔE2000 perceptual distance. Useful when translating between design-system, web-standard, and industrial color references.
Closest in X11 named colors
Top 6 ΔE2000-closest entries within the same collection.
Closest Pantone matches
Top 6 ΔE2000-closest Pantone references. Cross-system matching is approximate — see disclaimer.
Closest RAL Classic matches
Top 6 ΔE2000-closest RAL Classic references for industrial coating cross-reference.
RAL 5018
#3F888F
Turquoise blue
RAL 5024
#5D9B9B
Pastel blue
RAL 5021
#256D7B
Water blue
RAL 7000
#7E8B92
Squirrel grey
RAL 7042
#8D948D
Traffic grey A
RAL 7033
#7D8471
Cement grey
FAQ about Darkslategray4
What is the HEX code for Darkslategray4?
Darkslategray4 (darkslategray4) has the HEX code #528B8B. In RGB it is rgb(82, 139, 139), and in CMYK it is cmyk(41%, 0%, 0%, 45%).
What is the OKLCH value of Darkslategray4?
Darkslategray4 converts to oklch(0.598 0.060 195.7). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Darkslategray4 accessible for body text?
Used as a background, Darkslategray4 has a contrast ratio of 5.42:1 with black text and 3.87:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use black text and verify in real UI context.
What is the closest Pantone to Darkslategray4?
The closest Pantone reference to Darkslategray4 by ΔE2000 perceptual distance is Pantone 321 C (#008C95). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Darkslategray4?
The closest RAL Classic reference to Darkslategray4 by ΔE2000 distance is RAL 5018 (Turquoise blue, #3F888F). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Darkslategray4?
The complementary color (180° opposite on the HSL color wheel) of Darkslategray4 is #8A5151. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
X11 named colors (xorg rgb.txt)
The historical X11 color name list shipped in the xorg-server rgb.txt file. Roughly 550 entries covering classic computing color names like 'PapayaWhip', 'MediumAquamarine', and 'DarkSlateGray'. Many CSS named colors originate here. Use as a reference for legacy and creative color names. Most modern CSS implementations accept these names directly.
- Source type
- derived
- Confidence
- high
- License
- MIT/X11 license (X Consortium)
- Last reviewed
- 2026-05-24
Workflow tags
X11 colors are sRGB digital values from a 1980s color system. For print, convert to a process-appropriate color and proof against substrate.