the green gap

LITChlorophyll a and b absorb strongly in the blue and the red. In diethyl ether the peaks sit near 428 and 661 nm for Chl a and 453 and 642 nm for Chl b (Lichtenthaler & Buschmann 2001). Between them, roughly 500–600 nm, there is a trough. That is the green leaves send back.

LITThe curves drawn here are the measured spectra from the PhotochemCAD database (OMLC), resampled to 5 nm, not Gaussians. COMPUTEDThe transmitted colour of a leaf-like layer is computed through CIE 1931 2°, then Bradford-adapted from your chosen light to D65 for display. Nesting: a green gap wrapping a purple-tinted shoulder wrapping the orange-red absorption edge.

pigment density Chl a : b light D65A

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