Use Indigo (#4B0082) as primary text or icon color on white backgrounds — at 12.9:1 contrast it passes WCAG AAA for body copy. Avoid placing indigo text on dark surfaces; the contrast drops below the AA threshold.

As a brand color, Indigo (#4B0082) reads as high-energy and confident and premium and serious. It fits naturally into luxury, beauty, creative, premium subscription products. Use it as the primary identity color and pair with one neutral (white, off-white, or near-black). Test legibility on both your logo and small UI text before locking it in — saturation that works on a 200px logo can feel overpowering at favicon scale.

Indigo flatters cool-leaning skin tones (pink, rosy, blue undertones) and works best in autumn/winter collections. Pair it with cool neutrals (charcoal, slate, off-white, black) and it works as a sophisticated alternative to navy. Deep cool tones photograph richly under indoor light and read as quiet luxury — strong choice for eveningwear.

Indigo is a moody, atmospheric room color — perfect for libraries, dining rooms, bedrooms, and bars where you want the space to feel enclosed and cinematic. Pair with brass or unlacquered fixtures, warm overhead lighting (2700K bulbs), and natural-fiber rugs. Avoid using it in spaces with limited natural light unless that intimacy is the point.