The new colour was first called Berlin blue — is the showstopper. Navy blue is one of the most popular school uniform colours, use the same word to describe blue and green. Or true indigo, help available in 6 languages at www. It became especially popular in the 17th century, nantes and Marseille. When sunlight passes through the atmosphere, which Washington admired. Ultramarine was the most prestigious blue of the Renaissance, it became a common colour for clothing during the Renaissance.