IN THE VISIBLE LIGHT SPECTRUM (400~700NM), THE 550 TO 650NM WAVELENGTH SPECTRAL REGION (YELLOW AND ORANGE) IS WHERE THE SENSITIVITY LEVEL OF THE HUMAN EYE IS HIGHEST; ROYAL GOLD HAS A HUE OF 42.63 DEGREES, 100% SATURATION AND 55.29% LIGHTNESS. THIS COLOR HAS AN APPROXIMATE WAVELENGTH OF 593 NM.