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Trace components in forty‐eight samples in five whiskey categories were extracted into methylene chloride, concentrated and separated by capillary column gas chromatography. The technique of principal component analysis was applied to the peaks in the resulting gas chromatograms and the samples formed clusters according to category. Further studies showed that variation in sample composition due to dilution, blending, or contamination using a model contaminant could be detected with good sensitivity.
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Headley et al. (1989) studied this question.
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