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. Mora se koristiti dopuna metalne cijevi za ulje, a kuglice glave olovke moraju biti napravljene od tvrde legure - kuglica od volfram karbida. Performanse pisanja su bolje od običnih hemijskih olovaka. Tinta koja se sipa u dopunu mora biti 424 čisto plavo mastilo proizvedeno na fiksnoj tački. i 322 crnog mastila. Ove dvije boje imaju prednosti svjetlosne postojanosti, vodootpornosti i nepropusnosti. Dopune sa kugličnim vrhovima punjene sa ova dva mastila mogu se koristiti za arhivsko pisanje (uključujući dopune za plastične cevi, ali boja cevi mora biti svetlo žuta).
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.
