What is reflective is the definition of reflective.

Reflection, also known as reflected light, refers to the brightness of an object. White objects reflect almost all the light from the light source and have the strongest reflection. The exposure should be small; black objects absorb almost all the light from the light source and have no reflection, so the exposure should be high. Other objects have strong or weak reflections, more or less, depending on the nature, depth, and texture of their colors. Reflection has a direct impact on photography exposure and is also the main photography light source.