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Color Changes of Dyeings in Spectrophotometers Using Heterochromatic Illumination
Author(s) -
Hoffmann Konrad
Publication year - 1977
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.5080020212
Subject(s) - polyester , textile , evaporation , substrate (aquarium) , radiance , optics , chemistry , biological system , materials science , thermodynamics , composite material , physics , biology , ecology
In Spectrophotometers using heterochromatic illumination (so‐called reversed optics), total spectral radiance factor curves of textile dyeings showed marked changes on repeated measurements, approaching equilibrium after 15–20 min. For reactive dyes on cotton, color differences as large as 5 Adams‐Nickerson (AN) units were observed between the first and last measurements; for disperse dyes on polyester, the differences were below 2 AN units. They result from evaporation of water from the substrate— hence, “hygrochromism” —and place a principal limit on measurement accuracy of hygroscopic fabrics when using polychromatic illumination.