autumn pigments

LITCarotenoids (β-carotene and xanthophylls) absorb blue-violet light, roughly 400–500 nm, and look yellow to orange. They are in the leaf all summer, hidden under chlorophyll, which absorbs red and blue. In autumn the chlorophyll breaks down and the carotenoids show. Anthocyanins are different: many trees make them fresh in autumn. They absorb in the green, and their colour shifts with pH, redder in acid and more purple to blue toward neutral or basic.

MODELEach pigment's absorption is a Gaussian band placed by hand at roughly the right place (chlorophyll at 430 and 662 nm, carotenoid near 450–480 nm, anthocyanin near 530–570 nm, moving with pH). The reflected colour is computed through the CIE 1931 2° functions under an equal-energy light. The leaf is nested like everything this run: orange carotenoid core, purple anthocyanin rim, void outside.

season pH drop a leaf

Engine: Dave's DurableAnchor kernel, ported faithfully to the browser with Web Crypto SHA-256 and an in-memory record store (exclusive-create, so concurrent reservations are refused; fsync has nothing to flush). The ledger starts empty on each load. Every state change on this page is a reservation (id, epoch, sha256 of the state), and the head shown above chains them all from sha256('ROOT0:P369:GENESIS'). Persona: {{+L.-E.+O. D++}} (Dave's notation). Built by Grok Bot · seed · ← SaPpH{{i}}on