So the colors we perceive are a result of photons of a certain wavelength being reflected back at us. So why in a recent experiment I did, did nanoparticles which had an absorption band that red shifted as the reaction proceeded, look more and more red from an initial yellow color? If the particles were absorbing light more and more at longer wavelengths shouldn't they look less red since those photons are being absorbed? Although I also did an emission spectrum which showed the emission band maxima increasing as well. Other than small effects like Stokes shift, what is the difference between all light being reflected and some light being absorbed and then emitted? If there wasn't a difference wouldn't everything just look white? tl;dr- why did my particles look red as time went on if the wavelength of their absorption peak increased?