Midnight BlueCobalt BlueDeep Sky BlueEgyptian BlueBlueRoyal Blue

Egyptian blue, also known as calcium copper silicate or cuprorivaite, is a pigment used by Egyptians for thousands of years. It is considered to be the first synthetic pigment. The pigment was known to the Romans by the name caeruleum. After the Roman era, Egyptian Blue fell from usage and the manner of its creation…

Of the colours in the visible spectrum of light, blue has a very short wavelength, while red has the longest wavelength. When sunlight passes through the atmosphere, the blue wavelengths are scattered more widely by the oxygen and nitrogen molecules, and more blue comes to our eyes. This effect is called Rayleigh scattering, after Lord…

Royal blue describes both a bright shade and a dark shade of azure blue. It is said to have been invented by millers in Rode, Somerset, a consortium of which won a competition to make a dress for the British queen, Charlotte of Mecklenburg-Strelitz. Traditionally, dictionaries define royal blue as a deep to dark blue,…