15 Interesting facts about colors

The colors of red, orange, and yellow are considered warm colors because they evoke images of fire. They contrast with cool tones, which evoke thoughts of water, and include shades of blue, green, and purple.

The rainbow used to have just 5 colours – until 1704 when Sir Isaac Newton added orange and indigo to the list simply because he had a fondness for the supposedly mystical properties of the number 7.