A glowing hot solid typically produces a continuous spectrum.
What spectrum is this
A continuous spectrum contains an unbroken, smooth spread of all wavelengths or colors in the electromagnetic spectrum.
When a solid material is heated to a high temperature, such as metal being heated to incandescence, it emits light across a wide range of wavelengths.
This emission results in a continuous spectrum that shows a seamless band of colors without any distinct lines or gaps.
The colors observed in the spectrum correspond to the various energies of photons emitted by the hot solid, ranging from infrared through the visible spectrum (which we perceive as colors) to ultraviolet and beyond.