Studies on the cosmetic criteria of the hair after shampoo.
Synopsis An objectivised sensorial method for evaluating the effects of shampoos on the appearance and manageability of the hair is described. Two different shampoos for greasy hair were applied twice weekly for a period of 4 weeks to the right and left sides (split-head tests) of six subjects having greasy hair, the same shampoo being applied to the same side. A trained observer used a continuous rating scale to assess nine cosmetic parameters; overall assessments by observer and subjects were noted. Evaluations were made immediately after and at various intervals following shampoo. The data were presented in 'profile graphs' and evaluated statistically. Shampoo A was found to be significantly better (P < 0.05) than shampoo B for all parameters immediately after shampoo and for six parameters after 1 day. The differences between A and B were no longer significant after 2 days, and only marginal differences were noted after 3 and 4 days. Analysis of the results of forty additional split-head tests carried out with ten different shampoos revealed interdependence (P < 0.01) between some parameters. Our results show the elective action of shampoos on the cosmetic parameters, the duration and limits of this action, and the interdependence between certain parameters.
Scandel
J
J
Vick International, Division of Richardson Merrell Inc., Centre de Recherche Lab. Lachartre, 10 rue de Citeaux, 75012 Paris.
Reinstein
J A
JA
Brudney
N
N