1. The high-grade ballpoint pens have obvious trademarks and model marks on the pen holder, and there are also obvious brand names, production dates and "DA" marks at the end of the refill ("DA" marks are the first two characters in Chinese Pinyin of archives. combination of letters).
2. The refill of the metal oil tube must be used, and the balls of the pen head must be made of hard alloy - tungsten carbide balls. The writing performance is better than that of ordinary ballpoint pens. The ink poured into the refill must be 424 pure blue ink produced at a fixed point. and 322 black ink. These two inks have the advantages of light fastness, water resistance and impermeability. Ballpoint refills filled with these two inks can be used for archival writing (including plastic tubing refills, but the color of the tubing must be light yellow tubing).
3. On the packaging of the goods, there are signs and marks such as the trademark, model, manufacturer name, place of origin and quality inspection certificate. Fake and shoddy goods, the ink poured into the refill is not the archival ink recognized by the State Archives Administration, there is no "DA" mark on the refill, and there is no trademark, model, factory name, origin, and some are smuggled from abroad. Unlicensed pens The core is assembled to pretend to be an imported high-grade ballpoint pen.
