Not publicly, but a few people in berkeley are working on it. Here is a paper from last year: https://imjal.github.io/theory-of-tetrachromacy. (Disclaimer: i am on this paper).
They've prototyped displays that can test for it as well.
They've prototyped displays that can test for it as well.
As I recall (it's been many years; likely over a decade since I saw it) he tested it with a woman who was believed to have tetrachromatic vision. She could reliably tell the difference.
As a control, he tested it with a man who was trained as a graphic artist.
He too could reliably tell the difference.
That result strongly implied the test did not work as expected.
Do you know anything about this previous work? I tried reading the paper but was immediately out of my depth.