Test for Proteins. Burette test – Take 3 ml of egg albumin in a test tune and add an equal volume of 10% NaOH. Mix thoroughly and add 0.5% CuSO₄ drop wise. Mix well. A purple – violet or pinkish violet colour develops. Text for Fats. Solubility test – In five test tubes, take 3ml of water, alcohol, ether, benzene and chloroform. To each test tube add 3 drops of lipid. Shake well and note the solubility. The lipid floats on water but it is miscible with ether, benzene and chloroform, while it sinks to the bottom in alcohol.