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We do not know whether it is going to run out when using marker pen, which may cause much inconvenience. 'I can see' marker pen innovatively adopts water injection pattern of ballpoint pen. The transparent structurs of nib can make you see the rest of the water clearly. And also the colour of the nib will change.
China Academy of Art
Yufan Huang, Qiwen Wu,Zhiyong Zhao