Chartreuse sits at the exact midpoint between yellow and green, an electric hue that seems to vibrate at the seam where the two colors meet. It takes its name from a French herbal liqueur, the famous green cordial first distilled by Carthusian monks, and something of that potency clings to it still. This is not a gentle color. It is one of the most polarizing on the wheel, adored and resisted in almost equal measure, and the reason is its sheer intensity.

Spread across a large surface it becomes exhausting, too loud and too bright to live behind anything else, which is why designers almost never trust it as a background. Give it a smaller role, though, and it becomes hard to beat. As an accent it is unmatched, a jolt of energy that pulls the eye without hesitation. Chartreuse shares its DNA with things built to be seen and not missed: the fuzzy skin of a tennis ball, the glow of high-visibility safety gear, the deliberate urgency of a color that exists to command attention. Used with restraint it borrows that same signalling power.

The trick is deployment in small doses, and against the right company. Set it on black and it snaps forward like a struck match. Lay it over bone white and it reads crisp and modern. Place it beside a deep violet and the two colors sharpen each other, the cool depth of the purple making the chartreuse burn all the brighter. Handled well, it is less a color than a punctuation mark, a single charged note that lifts everything around it. Handled carelessly, it overwhelms. Chartreuse rewards the designer who knows exactly how much is enough and then stops there.