Nail the exact color gunmetal gray in your design by using the code from any one of these systems for color identification.
|RGB||r: 141, g: 145, b: 141|
|HSL||h: 120°, s: 2%, l: 56%|
|HSV||h: 120°, s: 3%, v: 57%|
|CMYK||c: 3%, m: 0%, y: 3%, k: 43%|
If you're identifying color for pretty much anything digital, you're working in an RGB colorspace. If the project you're working on requires percentage representation, gunmetal gray is made of 55% red, 57% green, and 55% blue.
If you're identifying color for a print project, you're most likely using a CMYK colorspace—the percentages are 3% cyan, 0% magenta, 3% yellow, 43% black.