SCTT (Stratum Corneum Turnover Time)

GEL 1: (patch test: non-irritating). 5% HC/P2-1000, pH 7
GEL 2: (patch test: non-irritating). 5% HC/P2-1000, pH 3
GEL 3: (patch test: slightly irritating). 5% glycolic acid, pH3
Method:
- Dansyl chloride staining technique
- Gels applied twice a day
- 20 volunteers