Method of analysis fo quality of cosmetics for hair care
Answers
Shampoos :
Foam & foam Stability:Test for foam stability:- 200ml. of a surfactant solution is dropped into a glass column containing 50 ml of same solution. The height of the foam generated is measured immediately and again after specific time interval. It is measured in volume
Detergency & coloring action:Cleaning action of shampoo is find out by “ wool yarn in grease”. Place 5gms of wool yarn in grease in 200ml of water containing 1gms of shamppo in flask. Temperature of water should be 35c. Shake the f1ask for 4 min. at the rate of 50 times a min. remove the solution and take out the sample. Dry the sample and weight it. Calculate amount of soil removed under experimental condition.
Eye Irritation:0.1 ml of test solution is instilled in eye of rabbit. Keep one eye for control test. After 4sec both eye are washed with saline and observation made after 1 hour.
Oral toxicity:It is given in terms of LD50 .if LD50 is 5 or more the toxicity is considered as low. Lower the LD50, the greater the toxicity