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Enthusiasm of the author for a subject in which he has carried out many instructive studies makes this book interesting reading, but no real proof is presented that colors have specific curative value. There is a tendency to use the terms color and light interchangeably, and this makes for confusing conclusions. Another defect is found in the fallacy of "post hoc, ergo propter hoc" reasoning, with recoveries from various disorders attributed to certain colors. It might as easily have been stated that the recovery was in spite of the color.
A chapter dealing with diagnosis through color offers nothing new and, in fact, quotes such statements as "thick, dirty, muddy complexion (also the ruddy face and bulbous nose): Evidence of autotoxemia," for both diabetes and tuberculous peritonitis, "bronzing of the skin," and in late stages of cancer "yellowish, yellowish brown, or greenish brown skin" are cited as diagnostic pointers.
Color Psychology and Color Therapy: A Factual Study of the Influence of Color on Human Life. JAMA. 1950;144(3):280. doi:10.1001/jama.1950.02920030068033