The study of drying period to tannin content on Guazuma ulmifolia Lamk. Was conduted to assess the optimal perod of drying as well as the maximum tanin content on the raw material. Both Sun and oven drying are commonly applied in post harvest handing, but this study used only oven-died (40◦C) for the following time: 6,7 hours. The tanin content was determined by spectrophotometry UV-Vs (Folin…