#343b4e - Old Mill color

A deep, muted slate-blue with strong charcoal undertones, this color reads as cool and sophisticated—nearly navy but softened by gray and a whisper of green. It evokes twilight skies and industrial interiors, lending a restrained, moody elegance to interfaces, branding, or home decor. It pairs beautifully with warm metallics, creamy off-whites, and blush pastels for contrast, and works well as a background or accent to provide depth without overwhelming brighter accents.

#343b4e color RGB value is 52, 59, 78, and the CMYK value is 0.333, 0.244, 0.00, 0.694. Alternative names for that color are: old mill, black, darkslategray, bright gray, outer space, indigo, darkslategrey.

Open Color Palette Builder Open Color Wheel

Color Conversion

Name	Values	CSS
RGB(0-255)	52, 59, 78	rgb(52, 59, 78)
CMYK	0.333, 0.244, 0.00, 0.694	-
sRGB	0.204, 0.231, 0.306	rgb(20.4%, 23.1%, 30.6%)
Adobe® 98 RGB compatible	0.223, 0.241, 0.308	color(a98-rgb, 0.223, 0.241, 0.308)
HCT	269, 16.7, 25.0	color(--hct, 269, 11.5%, 25%)
HSL	224, 20.0, 25.5	hsl(224, 20%, 25.5%)
HSV	224, 33.3, 30.6	color(--hsv, 224, 33.3%, 30.6%)
HWB	224, 20.4, 69.4	hwb(224, 20.4%, 69.4%)
Lab	24.8, 0.923, -12.7	lab(24.8%, 0.923, -12.7)
P3	0.209, 0.231, 0.300	color(display-p3, 0.209, 0.231, 0.3)
XYZ D50	0.0427, 0.0436, 0.0591	color(xyz-d50, 0.043, 0.044, 0.059)