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As pen sucks ink in the ordinary ink bottle ,the hand holding part of the pen can easily be stained with the ink when only use a little ink. The problem can be solved by graphite arc, when using it . the 90 degrees angle upward, arcuate side landing the ground, with a hand hold graphite arc, another hand make the pen suck ink, according to capacity of ink to decide the tilt angle of the bottle body to ensure that only written part in ink.
Fanxi Tang,Zuochen Hu,Ran Shi,Qiuying Xu