Influence of paper whiteness and luminescent background on visibility of security features on papers and documents.

ISO brightness, fluorescence spectra, and the fluorescence integrated intensity of papers from domestic and foreign manufacturers were studied. The contrast index of the tested paper samples, which is defined as the ratio of the ISO brightness to the paper integrated fluorescence intensity in the spectral range from 380 to 700 nm, was estimated. An alternative method for controlling the paper background fluorescence level was proposed. [ABSTRACT FROM AUTHOR]