In griffith's introduction to electrodynamics, he goes over dispersion/absorption using the oscillating electron model. I understand the theory but I am confused about how it relates to how materials appear to us. He says that the material will be practically opaque in the frequency range with maximum absorption due to the large dissipation of energy from resonance. Then he says transparent materials have their significant resonances in the ultraviolet, which makes sense to me as to why we can see through them, they don't really absorb any visible light so it passes right through them. So from this, my understanding is that a materials color depends where on the spectrum their resonance frequencies lie. My confusion comes in when I try to think of a black material. I don't see any color coming from it, yet I can't see through it. Is it that the resonance frequencies are so scattered across the spectrum that it doesn't show any distinct color?