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A Critical Appraisal of the International Daylight Fastness Test
Author(s) -
MCLAREN K.
Publication year - 1957
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1957.tb02184.x
Subject(s) - daylight , reliability (semiconductor) , humidity , reproducibility , environmental science , sunlight , test (biology) , meteorology , forensic engineering , statistics , geography , engineering , mathematics , optics , ecology , physics , biology , power (physics) , quantum mechanics
The international daylight fastness test has been critically examined to determine its reproducibility and its reliability. Only one variable factor in exposure— the effective humidity— has been found to cause variations in assessment, and this is governed primarily by the proportion of sunlight falling on the pattern during exposure. This causes the assessments of humidity‐sensitive materials to be up to 2 grades higher in sunny countries than in predominantly cloudy regions. This variation can be eliminated only at the expense of the reliability of the result, a solution which cannot be accepted. There is evidence to suggest, however, that the reproducibility of the method would be very good for the majority of fabrics, whose sensitivity to humidity, like that of the standards, is low. The test is a reliable guide to the expected resistance to fading which will occur during use, even of sensitive materials, providing that the daylight test is carried out in the same country as that in which the fabric is to be used or in one whose climate is similar and providing that the fabric does not become wetted during use.