Consider the image below Does it emit all 3 types of heat in the form of UV, IR and light? At what threshold does light start to appear and what colors should it illuminate? Hypothetically, say I have an induction furnace and is capable of setting frequencies to about 700THz, will it be able to illuminate a colored(violet) light at that frequency? So, what limits its color? Does the illumination depends on molecular or electron dynamic response? I'd be delighted to see response from the forum. Thank you.