1920).Īmerican Revolutionary War writer Thomas Paine proposed that a rainbow flag be used as a maritime flag, to signify neutral ships in time of war. A similar flag is used in Andean indigenism in Peru and Bolivia to represent the legacy of the Inca Empire (since ca. The International Co-operative Alliance adopted a rainbow flag in 1925. Its international use dates back to the beginning of the 20th century. The international peace flag is especially popular in Italy (since 1961) and to a lesser extent Europe and the rest of the world also known as the PACE flag. The pride flag represents LGBT pride (since 1978). However, when not seen through a prism, the color he deemed 'blue' is actually blue-green, or cyan, what he called 'violet' is today known as dark blue, and 'indigo' is a normal blue.There are several independent rainbow flags in use today. When Isaac Newton first saw a rainbow through a prism, he labeled the colors red, orange, yellow, green, blue, indigo, and violet. The designs differ, but many of the colors are based on the spectral colors of the visible light spectrum. A rainbow flag is a multicolored flag consisting of the colors of the rainbow.