In fruits and in many vegetables, the presence of high UV-absorbent chemicals limits UVC depth of penetration of the surface (epidermis) to 10–40mm. In addition, natural and added waxes (lipids) contribute to diffuse and specular UVC reflectance. Specular reflectance is the mirror-like reflection of UV (or other kinds of waves) from a surface in which UV from a single incident direction is reflected into a single outgoing (reflected) direction and decreases UVC exposure levels