Ali, AkhyarAyu, Dewi FortunaRossi, EvyVicky Noviani, Dian2014-01-182014-01-182014-01-18wahyu sari yenihttp://hdl.handle.net/123456789/5272used cooking oil can be used as base substance To manufactured of transparent solid soap. This aims of this reseach,,was determine effict of the addition stearic acid and glycerin with various concentrations of the quality of transparent solid ,soap and determine the best formulation of transparent solid soap. This research conducted in the Laboratory Processing and Analysis-of Agticuttural Technology, Faculty of Agriculture, University of Riau. This research carried out an experimantelly using a completely randomized design (RAlL) with 8 treatments and 3 repetition. Data quality of product was analyzed statistically variance. If it shows F-hit greater than F-tab then do Tukey test. Whereas organoleptic test carried out in non-parametric. If it shows F hit greater than F tab then do Friedman test at level 5 %. The results showed that the addition of stearic acid and glycerin provide effect to the water content, ALB, and pH. Based on the results of the research best formulation of transparent solid soap is AG6 (stearic acid 12%, glycerin t 11%) with 3,09% water content,. ALB not detected, the volume of foam144.244cm, pH 10.5, no cause iritation and the result organoleptic test panelist for colour, flavor, texture and foam showed preference.enused cooking oiltransparent solid soapstearic acidglycerinUR-Scientific Work Lecturer