Oblique Illumination Dispersion Staining
Transmitted Phase Contrast Illumination, 20X Objective

These are the colors seen when using phase contrast illumination with the 1.61 optical glass standard in Cargille
Melt Mount 1.605 refractive index liquid. The wavelength at which this glass and this liquid match is 530 nanometers.
The difference in dispersion is 0.009.