Latest Wave of Gonioapparent Colorants Illuminated in New Standard

摘要

First generation gonioapparent colorants are materials pigmented with metal flakes that change lightness as illumination angles change. Used heavily in automotive coatings, the first generation of gonioapparent materials was covered by ASTM International standard E2194, Practice for Multiangle Color Measurement of Metal Flake Pigmented Materials, first published in 2003. Now, a second generation of gonioapparent colorants that change color with varying illumination and viewing angles has led to the development of a new standard, E2539, Practice for Multiangle Color Measurement of Interference Pigments. Both E2194 and E2539 are under the jurisdiction of Subcommittee E12.12 on Gonioapparent Color; part of ASTM International Committee E12 on Color and Appearance.