Unsaturated test-

Add 10 drops of Huble’s Iodine reagent to 10ml of chloroform. Chloroform assumes a pink color due to the free iodine. The solution is divided equally into the test tubes.
Add the oil number 1 to the test tube by drop shaking the tube vigorously after each addition till the pink colour of the solution just disapper. The number of oil drops required are noted. The experiment is repeated by oil 2 and 3 adding to test tubes. The more number of drops required to discharge the pink colour, the less is the unsaturation.