4. Phytochemical test Tannins Using FeCl3 Phytochemical test is a qualitative test for the suspected presence of tannin in the extract of guava leaves. Phytochemical test conducted in this study that adding extracts with FeCl3 reagent indicated by the color change of green or blue-black ink. Phytochemical test using FeCl3 is used to determine whether a sample contains a phenol group is indicated by a green color blackish or dark blue after being added with FeCl3, so if phytochemical with FeCl3 test gives