Recombination

LITIn the Experimentum Crucis, Newton passed a single colour from one prism through a second prism, and it stayed one colour. In his 1672 letter "A New Theory about Light and Colours" (Phil. Trans.) he argued that white light is a mixture. He also brought the spread spectrum back together with a lens (or a second, inverted prism) and recovered white. (Batch 10's Opticks pages hold the history.)

COMPUTEDThe spectrum of a 6504 K blackbody (close to D65, which sits about 0.006 above the Planck locus in y) is split into 40 bands. The lens recombines whatever you leave open, and the result goes through CIE. Tap the spectrum to block a band, as with Newton's comb: the recombined light then takes the complement of what you removed. Open every band and it returns exactly to the source's white. Nesting: the colours fanned out in shells, folded back into one white, inside the void.

open allcrucis: one band

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