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Daylight fluorescent pigments are complex artists’ colorants made of multiple admixed dyes and additives infused in a polymer resin. Their unique photochemistry creates interesting optical effects that make them appealing for a range of applications. The wavelength dependence of the dyes’ emissive properties has also led to their use in works meant to be displayed under nontraditional high energy light sources, such as blacklights. The intended display methods and the photochemistry of the constituent dyes can lead to chemical instability and also pose unique challenges for conservation and exhibition. In Part 1 of this research, we reported on the chemical constituents of colorants from two major manufacturers. In this paper, we provide a comprehensive report of the spectral properties and lightfastness of paints prepared with the pigments. The optical properties and chemical stability of these colorants are correlated with the composition. Variation in composition can lead to unique markers that could be useful for conservation treatment and exhibition considerations. Changes in the dyes used in the pigment formulation over time are considered in the comparison of two objects: a Stephen Sprouse silvered leather motorcycle jacket featuring fluorescent art by Stefano Castronovo and selections from the  Day-Glo Designer’s Guide  from 1969.

Shedding Light on Daylight Fluorescent Artists’ Pigments, Part 2: Spectral Properties and Light Stability