The Guardian's article on this[1] includes a quote from an eminent colour expert at City:

> The claim left one expert bemused. “It is not a new colour,” said John Barbur, a vision scientist at City St George’s, University of London. “It’s a more saturated green that can only be produced in a subject with normal red-green chromatic mechanism when the only input comes from M cones.” The work, he said, had “limited value”.

[1] https://www.theguardian.com/science/2025/apr/18/scientists-c...