Eight petroleum-based synthetic food dyes must be phased out of the American food supply and medications within the next year ...

Chlorophyll makes plants look green, carotene makes them look red or orange, and xanthophyll makes them look yellow. Plants make fruits and flowers look blue by shifting acidity levels ...

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.