I used to see the rule that ballpoint pens are not allowed in the college entrance examination. I think it is uniform and beautiful or easy to mark papers. Later, I learned from my own experience that ballpoint pens were allowed to be used in order to prevent cheating in exams! ! !
It is said that the ballpoint pen is oily, and the handwriting can't enter the fiber of the paper, so it can be modified. If it is a carbon pen, the handwriting can penetrate into the paper fiber and cannot be modified, so the current account books, checks, formal exams, signing contracts, etc. It can't be a ballpoint pen, but it must be a carbon pen.
Now there is a liquid on the market, the specific composition is unknown, which is specially used to eliminate the traces of ballpoint pens. If it is applied to the handwriting of a ballpoint pen, the trace of the ballpoint pen will disappear without a trace in an instant. ! !
Ha ha. . This is even more magical than witnessing the miracle moment in Liu Qian's magic. I witnessed it myself. On 1993, at a construction site in Gaolan, Zhuhai, several migrant workers from Sichuan changed their work card records in this way (when moving materials to the dock, the recorder recorded the moving times with a ballpoint pen, and when moving to the warehouse, someone signed for it, but I have seen each of these Sichuanese at least once, and there is no warehouse receipt at all, so I wiped them with this magical liquid.