Dichromatism
0Dichromatism, by Wikipedia https://en.wikipedia.org/wiki?curid=1001908 / CC BY SA 3.0
#Color_appearance_phenomena
#Color_vision
#Color
#Optics
Dichromatism （or polychromatism） is a phenomenon where a material or solution's hue is dependent on both the concentration of the absorbing substance and the depth or thickness of the medium traversed.
In most substances which are not dichromatic, only the brightness and saturation of the colour depend on their concentration and layer thickness.
A drop of pumpkin seed oil on a white plate, showing dichromatism Examples of dichromatic substances are pumpkin seed oil, bromophenol blue, and resazurin.
When the layer of pumpkin seed oil is less than 0.
7 mm thick, the oil appears bright green, and in layer thicker than this, it appears bright red.
The phenomenon is related to both the physical chemistry properties of the substance and the physiological response of the human visual system to colour.
This combined physicochemical–physiological basis was first explained in 2007.
Dichromatic properties can be explained by the Beer-Lambert law and by the excitation characteristics of the three types of cone photoreceptors in the human retina.
Dichromatism is potentially observable in any substance that has an absorption spectrum with one wide but shallow local minimum and one narrow but deep local minimum.
The apparent width of the deep minimum may also be limited by the end of the visible range of human eye; in this case, the true full width may not necessarily be narrow.
As the thickness of the substance increases, the perceived hue changes from that defined by the position of the wide-but-shallow minimum （in thin layers） to the hue of the deep-but-narrow minimum （in thick layers）.
The absorbance spectrum of pumpkin seed oil has the wide-but-shallow minimum in the green region of the spectrum and deep local minimum in the red region.
In thin layers, the absorption at any specific green wavelength is not as low as it is for the red ...
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