Absorption spectra from (a) human urine samples with various pigments

Urinalysis - Wikipedia

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Absorbance measurements of oxidation of homogentisic acid accelerated by the addition of alkaline solution with sodium hypochlorite pentahydrate

What causes objects to appear different colors? Is it due to how much red, green, and blue wavelengths are absorbed and/or reflected, or something else entirely? - Quora

IJMS, Free Full-Text

Treasures from the Color Archive

UV-visible absorption spectra of anthocyanins in human urine and

Absorption SPectrum

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Light absorption spectrum hi-res stock photography and images - Alamy

Sex-specific stone-forming phenotype in mice during hypercalciuria

Characteristics of human urine absorption spectra

Spot tests: past and present