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Many distillers believe a spirit’s flavor is established once the distillation process is complete or when the spirit is barreled and blended. The innovative work completed by Dr. Peterson and Dr. Kokkinidou would indicate the selection and pairing of the proofing water with the spirit is the actual last opportunity to significantly affect a distilled spirits taste. New research being released at the ADI meeting was designed to evaluate the behavior of specific aldehydes and ketones that are common in all/most distilled spirits. Aldehydes and ketones are primary drivers of distilled spirit tastes. The research evaluated the reaction of the same aldehydes and ketones found in vodka and whiskey distillates using two distinct waters in the proofing process. This presentation may increase a distiller’s understanding of what proofing water is contributing to a spirits taste.