B

Beer's law

BFD(l:c)

Blackbody, Full radiator, Planckian radiator.
An ideal thermal radiator capable of completely absorbing all incident radiant flux at any wavelength, direction of incidence or polarization providing the maximum spectral power distribution depending on temperature alone.

Bleeding
The unintentional transfer of colouring matter from one medium to or through another.

Bloom
The scattering of light in directions near the specular angle of reflection by a deposit on or exudation from the specimin.

Brightness
The attribute of a visual sensation by which an area appears to exhibit more or less light.

Bronzing
A metallic colouration seen when viewing the light reflected at angles near the angle of specular reflection, the colour is usually quite different from that seen for other directions.