"Writing" means writing the word "new" or "8" in cursive script with a smooth surface. Generally, the paper is not pulled, and the water distribution is uniform.
It is considered that the handshake nib is consistent with the thickness of the four kinds of handwriting.
"Batch", press the pen tip almost against the thumb nail, and the flexibility of soft and hard electricity is the same.
Second, check the tip sleeve and tongue: "Look", aim the tip of the nib sleeve at the tip of the nib sleeve, and the tip and the tip sleeve should be slightly separated from the tip of the wind tip by about one and a half iridium particles. For fountain pens without nib sleeves, the surface of the nib should be smooth, and the nib of backwater f9 should stand tightly on the nib.
Third, check the water absorption function: "Suction", suck the red ink mixed with 50% clear water into the pen to see if the parts are flexible. "Pinch", squeeze the ink out of the pen grease to see the water absorption.
4. Check the pen container; "Look", slowly turn the pen in the sun, and observe whether the color between the back of the rod sleeve B and the tip sleeve is consistent, whether there are obvious knife marks on the surface of the pen holder, and whether the trademark is clear. "Touch", the end of the rod should match without any phenomenon, and the end of the rod should be tightly inserted into the pen holder without moving.
5. Check the pen container: "skill", meter, then put it down and let it recover. Close to the pen cover. Hold the pen with your fingers and hold the bead for about five millimeters. Repeat this several times.