This study aims to determine the effect of vegetable tanners which derived from areca nuts in retanning process on the physical quality of tilapia tanned skin and analyze for the best concentration of areca nut (areca catechu). This study used a randomized block design with 3 treatments, the concentrations of areca nut (areca catechu) extract are 7,5%, 10%, 12,5% as A1, A2, A3 respectively whic…