Testing the Hypothesis

This will take some time to complete as I need to locate and purchase some light sources. Some of these will be in the deep infrared while others will have to be between 350 nanometers and 175 nanometers in the ultra-violet. All of them must have known luminosities, and dominant wavelengths. They must also have very narrow bandwidths which are almost monochromatic.

One observation in nature of a double rainbow partially confirms the hypothesis but yeilds an unexpected complication.

The second "bow" is further out and repeats the same pattern of colors in the same order, as the first "bow" but is spaced much further out than the hypothesis would suggest. The second bow is however half the width of the first bow,- as would be expected if the second bow is the appearance of Spectral 12. The appearance of an invisible spectral suggests the presence of a threshold in luminosity a hue must cross in order to be seen. Normally, Spectral 12 would not cross this threshold, and would remain invisible. However, if this is the case, why does Spectral Magenta remain invisible when Spectral 12 does cross this threshold?

Two visible spectrals joined by an invisible color, Spectral Magenta. Now that is a mystery to account for. I wonder if there are similar luminosity gaps in the subharmonics of Spectral Magenta, or if perhaps the human eye simply cannot respond to this hue, making the luminosity gap unreal. Here a photoelectric cell capable of responding to 375 nm could readily supply the answere. A measurable luminosity at this wavelength would indicate the human eye can't respond to this hue.