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Optical methods for measuring the pearlescent effect in toiletries
Author(s) -
MILLER DENNIS J.,
RENG ALWIN K.,
SKRYPZAK WERNER
Publication year - 1988
Publication title -
international journal of cosmetic science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 62
eISSN - 1468-2494
pISSN - 0142-5463
DOI - 10.1111/j.1467-2494.1988.tb00015.x
Subject(s) - turbidity , optics , measure (data warehouse) , standard deviation , computer science , artificial intelligence , computer vision , mathematics , physics , statistics , geology , data mining , oceanography
Synopsis Pearling agents used to improve the appearance of toiletries are generally judged visually, as it is difficult to devise suitable quantitative tests. If a pearling agent is added to a stirred liquid, moving light and dark patches may be seen. A method has been developed to put this simple test on a quantitative basis. The reflected light is measured using a fibre optic probe. An on‐line computer calculates the ratio of the standard deviation to the mean of the intensity; this is a measure of the pearlescent effect. By combining such measurements with turbidity data, a two‐parameter description of the appearance of the product is obtained. The method may be used for quality control, comparison of commercial formulations or to monitor changes during storage.