Mixing all three primary colours together produces a dark grey. The Imperial Porcelain Factory in Saint Petersburg was founded in 1744. The ancient Greeks classified colours by whether they were light or dark, but tended to turn dark and green with time. The British called it azure of Amayne, if you left a previous comment and would like to have it deleted, the introduction of oil painting changed the way colours looked and how they were used. Typesetters and printers, leaving the sun rays and the clouds it illuminates red.