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Dark blue became a common colour for military uniforms and later, in the late 20th century, for business suits.

In the Islamic world, blue was of secondary importance to green, believed to be the favourite colour of the.

Another common blue pigment was , which was made by grinding blue cobalt glass into a fine powder.

The uniforms of sailors are usually dark blue, those of air forces lighter blue.

The staff was welcoming, warm, and helpful.