| abstract |
A fluorescent marking composition containing particles of an organic material which has a glass transition temperature of at least 30° C. and an average particle size of at least 30 nm, and emitting fluorescence in a visible light range, or absorbing infrared light having a wavelength of at least 700 nm and emitting a light in an infrared wavelength range, which composition is excellent in dispersion stability, light resistance, and heat and light resistance, and provides a mark which does not bleed. |