I was wondering about the nature of object's colour. I know that an object get its colour from the absorption of visible electromagnetic radiation, reflecting all the other wavelength. But if we take the case of a black object that absorbs every visible light, I know that photons will be absorbed by some molecules, then will be re-emitted with less energy because some of the energy has been "passed on" the molecule, in which it goes faster, thus, giving us heat. So, if we put a very intense light, does it simply change the amplitude and the object is still black or does the wavelength shift and gives a different result?
My guess would be that no matter the amplitude, the wavelength are the same and thus the black object will still appear black but I want to be sure with, maybe, a more scientific explanation? If you have also links of some sort, I would gladly appreciate it!