Dispersion Staining, Becke' Line
Becke' Line Dispersion Staining was first documented in 1911 by F. E. Wright in Publication #158 by
the Carnegie Institute. He noted that when a particle and a liquid matched refractive indices for some
wavelength in the visible range but they had different dispersion curves then two Becke' lines would
be formed on defocusing the particle. The Becke' line for the blue end of the spectrum would move
into the material with the steepest dispersion curve and the Becke'line for the red end of the
spectrum would move into the material with the flatest dispersion curve.
The first two images below show a refractive index match at 589 nanometers wavelength
Match at 670 nanometers wavelength
Match at 530 nanometers wavelength
Match at 490 nanometers wavelength
Match at 460 nanometers wavelength
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