X-rays is a term used to describe electromagnetic radiation of high energy and very short wavelength. X-Rays (between that of ultraviolet and gamma rays). X-Rays are not visible for the human eyes as we can only see a very small part of the light spectre around 3%. See Ultraviolet Radiation (UV), Microwaves and Remote Sensing in the eco fashion dictionary.
ECO-FASHION-DENIM AND DIAGRAMS DICTIONARIES OVERVIEW