Comment by lupire

The websites shows a slope from green to blue across turquoise, but al most of this is almost certainly calibration error, and people being forced to say blue or green when they want to say turquoise.

The true graph is most probably a very small slope on the green and blue ends, and rectangle of measurement error in the middle. The "you are 70% greener" conclusion is a textbook example of false precision that ruins the science.