HTML ⛶ Rainbow Facts! Colours of the rainbow: The 7 colours of the rainbow are: red, orange, yellow, green, blue, indigo, violet. What Makes a Rainbow? A rainbow is an arch of colours visible in the sky, caused by the refraction and dispersion of the sun's light by rain or other water droplets in the atmosphere. So to see a rainbow, you need mixed weather with a bit of sunshine and a bit of rain too! Rainbow Myth! There are several myths related to rainbows. Here is the most popular rainbow myth: There's a pot of gold at the rainbow's end. Find out more: Check the wikipedia page about rainbows to find out more.