Objective to study the efficiency of the ink from the extraction of tannin from guava leaf by using solvent acetone to make the ink from the nature. The dried leaves to crush the 15 g, put down the bottle shaped Apple size.Ml add extract mixed acetone percent by volume with ethyl alcohol 60 percent 80 โดยปริ standard ratio of 1:1 number 180 ml, into the jar. Stir well and were refined using machine Rotary Evaporator period 5 hours at 70 degrees Celsius. In order to extract tannin concentrations. Then filter extracts with filter paper. The results showed that15 g period 5 hours. To be effective, and the concentration can be sufficient to ink pen, whiteboard has
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