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In page Ultramarine:
"Large quantities are used in the manufacture of paper, and especially for producing a kind of pale blue writing paper which was popular in Britain.[1] During World War I, the RAF painted the outer roundels with a color made from ultramarine blue. This became BS 108(381C) aircraft blue. It was replaced in the 1960s by a new color made on phthalocyanine blue, called BS110(381C) roundel blue.[citation needed]
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