Aqueous solutions of CuCl2 are turquoise. Iodine in water is yellow, and when added to the copper solution the result is a green solution. When this aqueous solution is extracted with organic solvents ...

Aliphatic aldehydes and reducing sugars will form a yellow-to-red precipitate with Benedict's reagent, causing the blue solution to appear green-to-red. This reaction can be used as a test for such ...