Shades and colours of Blue
"Blue is the colour of the deep sea and the clear sky.
Pure blue, also known as high blue, is not mixed with any other colours.
Navy blue, also known as low blue, is the darkest shade of pure blue.
Sky blue or pale azure, midway on the RBG colour wheel between blue and cyan.
Extract of natural Indigo, the most popular dye before the invention of synthetic dyes.
Lapis lazuli was orginally used to make ultramarine.
Ultramarine, the most expensive blue during the Renaissance, is a slightly violet-blue.
Cobalt has been used since 2000 BC to colour cobalt glass, porcelain and stained glass windows of medieval cathedrals.
Cobalt blue of the synthetic pigment was invented in 1802 and was popular with Vincent van Gogh and other Impressionist painters.
Cyan is made by mixing equal amounts of blue and green light, or removing red from white light.
Prussian blue, invented in 1707, was the first modern synthetic blue.
Cerulean blue pigment was invented in 1805 and f...