RETROREFLECTING SIGNS AND THE LIKE WITH NOVEL DAY-NIGHT COLORATION

摘要

A retroreflective indicator providing differing day and night coloration is provided by a retroreflective material having a transparent fluorescent dye composition forwardly of the reflective surface which fluoresces light of a first wavelength band and transmits light of a second wavelength band. The retroreflective material has a front face, a body portion of synthetic plastic material and reflective formations disposed inwardly of the front face. Under the diffuse ultravoilet electromagnetic radiation characteristic of sunlight, the indicator will fluoresce a colored light representative of the first wavelength band while under the generally columnar lower frequency electromagnetic radiation characteristic of artificial nightlight provided by automobile headlight beams, the indicator will retroreflect a colored light representative of the second wavelength band.