The natural substance that contains all seven colors of the visible spectrum is called "white light." It is a combination of all the different wavelengths of light that are visible to the human eye.
White light can be found in various natural sources, such as the Sun. The Sun emits white light, which is then separated into its constituent colors when it passes through a prism or interacts with water droplets in the atmosphere, resulting in a rainbow. Other sources of white light include incandescent light bulbs, certain types of artificial lighting, and even reflections from white surfaces that reflect all colors of light.