According to earlier modeling description, there were skin reflectance spectra calculated for skin with most common properties: Melanin (volume fraction 2% in Epidermis); hemoglobin HbO2 and Hb (150 g Hb/liter ) and Thickness of collagen tissue in papillary dermis about 0.1mm.
What are the parts of this spectrum? This spectrum can be exploded in to several distinct spectra’s: Epidermis, Hemoglobin, There are also spectra’s of water and collagen substances, but they doesn’t play main role in our wavelength interval.
As you can see melanin in epidermis absorbs the most part of blue light ~470nm; hemoglobin absorbs green light ~252nm and red light ~640nm and infrared 850 are used to define papillary dermis thickness, because these wavelengths are less absorbed by melanin and hemoglobin.
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