Ah, mea culpa then. The other commenter says there's 6 million cone cells, which is a much larger number than the 1,000 in this experiment.

No, it's still within the span of the ordinary three color receptor types. It's just the ratios within those three are outside of the usual, possible ratios.

There's a Wikipedia article about the topic,

https://en.wikipedia.org/wiki/Impossible_color

Take It Down Act nears passage

Right!