it's known that for the visible part of EM wave(electromagnetic wave) , black materials absorb more visible light than white materials do . a friend of mine asked me if in general , black materials absorb more EM radiation(whose frequencies do not lie within the visible range) than white materials do . my 'conjecture' is that since the opacity of a material depends on its molecular structure(like the vibration/oscillation modes of CO2 cause the molecules to strongly absorb IR..?) , just because black materials can absorb more EM radiation than white materials do in the visible range doesn't directly mean that they can absorb more radiation of other frequencies , as those vibration modes could have no effect on its opacity to EM radiation other than visible light. As i'm not so sure about the concepts and the logic , I wonder if anyone could help me identify any falsehood/flaws in my claim..thanks in advance for paying attention to this thread..