1. Can be used: Archival record, and sign pen for the superivisor in enterprises and institutions and government official, students to write and test.
2. The length for writting is 2.5 times more than the ordinary gel ink pen.
3. No-cap of a pen can be witten in 6 months, tow years with a good cap to preserve.

4. The writting characters is water resistance, and can be stored for a long time.
5. Core technology, the nanopigment-based ink we uesd ie made by my company.
Ink patent number: 200610098358