Mustard Green — Mustard Green has the warm, muted yellow of prepared mustard, giving it its name. It belongs to the Green family: a dark, vivid tone with hex code #A8B504 and RGB values of 168, 181, 4. Its dominant channel values give it a warm undertone that reads as vivid rather than flat. Mustard Green pairs well with metallics like gold or brass for added richness and works nicely in graphic design projects. Nearest neighbors: gold.