#ff0001 - Rainbow’s Outer Rim color

An almost-pure vivid red with the red channel at maximum, zero green and a single unit of blue, producing an intensely saturated scarlet with an extremely subtle cool tint. It’s highly attention-grabbing, conveying urgency, passion, and energy. Ideal for warnings, call-to-action buttons, and accents where visibility matters. Pairs well with neutral palettes or cyan/teal complementary tones and deep navy for high contrast. On displays it reads as a bright, slightly electric red rather than a warm, muted crimson.