A difference test procedure (such as a duo-trio, triangle, or paired comparison test) can be used for determining whether there is a perceptible sensory difference between samples of two products. Difference testing can be extremely useful for determining if different trial treatments or processing changes have had a sensory effect; for detecting differences in samples due to different storage or transport conditions; or if products have a suspected taint or fault, especially when a control is available. These sensitive tests use a large panel of judges and allow detection of differences that might not be observed using other sensory tests.

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