whiter than white

LITPaper and cotton are naturally a little yellow because they absorb some blue. Optical brightening agents (fluorescent whitening agents, often stilbene derivatives) absorb near-UV light around 340–370 nm and re-emit blue light around 420–470 nm. That cancels the yellow cast and can push reflectance above 100% in the blue. Under a black light they glow.

MODELThe paper reflectance (a soft blue dip) and the brightener's emission band (Gaussian at 435 nm) are my shapes. The UV in the light source is a parameter, because the 380 nm CIE table cannot see UV directly. Colour goes through CIE with Bradford to D65. Nesting: the yellowed sheet inside a blue glow, rising to white, in the void.

brightener UV lamp: off

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