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Optical Studies: I–Relation of Colour to the Apparent Soilability of Textile Materials
Author(s) -
MANN H. B.,
MORTON T. H.
Publication year - 1959
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.1478-4408.1959.tb02304.x
Subject(s) - viscose , reflectivity , brightness , hue , mathematics , starch , degree (music) , textile , value (mathematics) , materials science , optics , chemistry , mineralogy , composite material , statistics , physics , organic chemistry , acoustics
The apparent degree of soiling of a coloured object is a matter of subjective assessment, but is, as we have been able to show with a group of observers, closely paralleled by the physical quantity H s , the diminution (%) in the brightness coefficient of the surface– H s = Y O −Y S /Y O ×100 A study of soiled coloured starch has indicated the possibility of relating H s and hence degree of apparent soiling to the physical concentration of soil and the reflectance spectrum of the original surface. It is possible to compute from the spectrum a characteristic empirical quantity, the Sim value, which ranks the coloured material in order of relative apparent unsoilability in a series of materials, similar in structure but differing in colour. The derivation of SMR values for coloured starch involves no optical hypothesis, and the generalisation to fibrous materials depends only on the essential optical similarities of the systems. Full practical details, with tabulated data, are given for the determination of the SME values of coloured fibres. The conclusions are discussed with special reference to the behaviour of carpets made from viscose rayon staple.