Fehling's Solution is a chemical reagent used to test for the presence of reducing sugars, such as glucose. It consists of two separate solutions, Fehling's A and Fehling's B, which contain copper(II) sulfate and sodium potassium tartrate, respectively. When mixed and heated with a reducing sugar, the copper ions are reduced, resulting in a color change from blue to red, indicating a positive test. This solution was developed by Hermann Fehling in the 19th century and is commonly used in laboratories for carbohydrate analysis. It is important to handle Fehling's Solution with care, as it contains hazardous chemicals.