Exposure fog (rt), английский Fog caused by any unwanted exposure of a film to ionizing radiation or light, at any time between manufacture and final fixing.
Background fluorescence (pt), английский Fluorescent residues were observed over the general surface of the part during the fluorescent penetrant inspection. it is usually due to poor emulsification or rinsing of the fluorescent penetrant, or excessive roughness of the surface causing entrapment of the fluorescent penetrant.
