Comment by ralferoo

The latter tests were all a bit pointless because they were just turquoise, and all looked much the same - a mix of blue and green, so I was pretty much answering based on whether it was bluer or greener than the previous image.

The results said "Your boundary is at hue 179, bluer than 82% of the population. For you, turquoise is green." and definitely if I was judging the boundary on a gradient, I'd have placed the line a bit further to the right.