"Olo" is said to be a saturated blue-green - but some say the existence of a new colour is "open to argument".

The team, who experimented on themselves and others, hope their findings could one day help improve tools for studying color ...

The colour, said to be a saturated shade of blue-green, cannot be seen by the naked eye without the help of stimulation A team of scientists claim to have discovered a new colour that no human has ...