Term: alpha-naphthol test: biochemical indicator of the presence of carbohydrates in a solution; if carbohydrates are present a violet ring is formed by reaction with alpha-naphthol in the presence of sulfuric acid
Broader: indicator: (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction | Unrelated: autosexing: (especially of domestic fowl) breeding to reveal differential sex characteristics at hatching