Newer spectrophotometric techniques for the absorption measurements of solutions of dyestuffs to determine their strengths are compared to the traditional methods of testing dye stuff shipments by visual appraisal of yarns or fabrics dyed by standard procedures. Sampling errors are measured and discussed in relation to a control-chart method of handling the resultant information. Various examples are cited.
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References
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Gibb, T.R.P. , "Optical Methods of Chemical Analysis," New York , McGraw-Hill Book Company, Inc., 1942, p. 74.
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Monego, C., and von Bergen, W., Am. Dyestuff Reptr.32, 1 (1943).
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