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This small book is invaluable to the hair dresser and brings much of value and interest to the layman and physician. The reader is first impressed by the great complexity of the subject. The number of dyestuffs, good and bad, harmful and less harmful, their innumerable combinations and the careful technic that must be followed in their successful use explain clearly why the practicing physician, who is only an amateur at best in his knowledge of hair dyeing, cannot give adequate advice on how to do it. He can only tell the prospective dyee to consult the best available hair dresser and to insist on a preliminary patch test, for "para," the hair dressers' name for paraphenylenediamine, is almost sure to be an ingredient of every effective hair dye.
On page 144 directions are given for the patch test, called the Sabouraud-Rousseau test. The use of eau de cologne as
Hair-Dyes and Hair-Dyeing Chemistry and Technique. JAMA. 1939;113(15):1438. doi:10.1001/jama.1939.02800400066040
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