1. The problem statement, all variables and given/known data Hi. Knowing the LRV, heat source and all other relevant details, how can we deduce the exact temp rise with black colour (or any other colour for that matter)?? 3. The attempt at a solution i think just like we do for metals, if we know the heat absorption coefficient, then it can be done. But unfortunately i cant find anything named "heat absorption coefficient" for black colour. Is there any equivalent?