Supporting teaching and learning essential equipment: pens, fountain pens, used to help people write letters, organized. Save ink that is sold in the market have little good prices. We can also manufacture ink that is applied to the mouth of the fountain. The pen or brush up using dopon speed by bringing 100 shell. Raw banana, Rambutan shell and Peel 20 grams each, frozen in 95% ethyl alcohol solution volume of 200 cubic centimeters, filter the aqueous solution by thin white cloth. Put in 250 cc beaker. 120 cc with an alcohol lamp is going to be cooked. but volume cc 30. leave to cool area to get solution ink replacement ink used on the market.
การแปล กรุณารอสักครู่..
![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)