A mix of blue and purple — and affectionately known in the Livingetc office as 'blurple' — indigo sits on the color spectrum directly between blue and violet. Its close proximity to both tones ...

When this happens, light becomes separated into a rainbow of colors—red, orange, yellow, green, blue, indigo (blue-violet), and violet. In this activity, you can make your own rainbow.

You can use a prism to split (or disperse) white light into a spectrum of colours: red, orange, yellow, green, blue, indigo and violet. Dispersed means that the colours are separated out.