Why milk resuting negative in molisch test?

Milk tests negative in the Molisch test because it contains primarily proteins and fats, rather than carbohydrates. The Molisch test is designed to detect the presence of carbohydrates through the formation of a purple ring when a carbohydrate is mixed with a phenolic reagent. Since milk lacks significant amounts of free carbohydrates, it does not produce the expected reaction, resulting in a negative outcome.