What is the positive color result of Seliwanoff's test?

A positive result for Seliwanoff's test is indicated by the development of a deep cherry-red color, which signifies the presence of ketoses, such as fructose, in the tested solution. This reaction occurs when the carbohydrate is heated with Seliwanoff's reagent, which contains concentrated hydrochloric acid and resorcinol. In contrast, aldoses, like glucose, typically produce a light pink color or no significant color change. This test is used to differentiate between aldoses and ketoses in carbohydrates.