> Scientists claim to have discovered 'new colour' no one has seen before

The research follows an experiment in which researchers in the US had laser pulses fired into their eyes.

By stimulating specific cells in the retina, the participants claim to have witnessed a blue-green colour that scientists have called "olo", but some experts have said the existence of a new colour is "open to argument".

https://www.bbc.co.uk/news/articles/clyq0n3em41o