There are blue paint colors, there are green paint colors - and then there are the ones that live somewhere in between. At first glance, these shades might all blur together, but design lovers know ...

"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 ...