Hi there!
Explanation:
For carbohydrates,you add an iodine solution to it.If it contains starch,it will turn a blue+black colour.
For proteins,you add a bierut solution to the protein mixture you are testing.If it turns purple or has purple in between layers it has protein.
For lipids,you add a Sudan III solution to the mixture of lipids and shake the test tube.A red layer forms on top and shows fats and oils are present.
Hope this helps!
