Concept

Shades of orange

Summary
In optics, orange has a wavelength between approximately 585 and 620 nm and a hue of 30° in HSV color space. In the RGB color space it is a secondary color numerically halfway between gamma-compressed red and yellow, as can be seen in the . The complementary color of orange is azure. Orange pigments are largely in the ochre or cadmium families, and absorb mostly blue light. Varieties of the color orange may differ in hue, chroma (also called saturation, intensity, or colorfulness) or lightness (or value, tone, or brightness), or in two or three of these qualities. Variations in value are also called tints and shades, a tint being an orange or other hue mixed with white, a shade being mixed with black. A large selection of these various colors is shown below. The color known as color wheel orange is the tone of orange that is a pure chroma on the HSV color wheel, the expression of which is known as the , exactly halfway between red and yellow. The complementary color of orange is azure. The web color called orange is defined in CSS as the hex triplet FFA500. There is a web color called dark orange. Safety orange Safety orange (also known as blaze orange, and a number of other names) was defined in ANSI standard Z535.1–1998 and is commonly used in a wide variety of contexts to warn of hazards, including: high-viz clothing, road cones, and as the background color in safety warning notices. International orange A shade of orange known as International orange is used in the aerospace industry to set objects apart from their surroundings, similar to Safety orange, but deeper and with a more reddish tone. It was the color used for the Space Shuttle pressure suits. The tone of international orange used to paint the Golden Gate Bridge in San Francisco, California is slightly lighter than the standard International orange used by military contractors and in engineering (shown below), thus increasing its visibility to ships. The 25 de Abril Bridge in Lisbon, Portugal also uses this color.
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