Underground

I keep noticing Underground as soon as a page starts feeling too neat. It's the gray that looks like concrete that's been handled: darker than Caveman, less taupe and softer than Kabul, and less notebook-warm than Major Brown.

Underground's undertone stays grounded and a touch cooler, with a subdued saturation that doesn't fog up the hierarchy. I reach for it in editorial layouts where you want the gutters and rules to feel solid, and in product interfaces for panels, sidebars, and dense content screens that need calm weight without going heavy. It also shows up nicely in publishing platforms when typography needs a darker stage that won't pull focus.

One quirk: because it's deeper, it can make thin UI strokes feel louder. If your artwork is already dark, pair it with lighter grays instead of pure white so the contrast stays controlled.