The color of an opaque object is due to the color it reflects.

When light strikes an object, it interacts with the object`s surface. Some of the light may be absorbed by the object, some may be transmitted through it, and some may be reflected.

An opaque object does not transmit light through it, meaning it does not allow light to pass through. Instead, it reflects a portion of the incident light. The color we perceive when looking at an opaque object is the color of light that is reflected off its surface.

The color of an object is determined by the wavelengths of light it reflects. For example, if an object appears red, it means that it reflects predominantly red light and absorbs other colors of light.

Different materials have different molecular or atomic structures, which interact with light in different ways. These interactions determine which wavelengths of light are absorbed and which are reflected, resulting in the perceived color of the object.

Therefore, the color of an opaque object is due to the color it reflects.