Oily ballpoint pen is the first generation ballpoint pen series product, which has been put on the market in batches for more than 60 years. After long-term improvement and perfection, the production technology of oily ballpoint pen is mature, the product performance is stable, the storage period is long and the writing performance is stable. Now it has become a traditional product variety in ballpoint pen products. The ink used for oily ballpoint pens has a high viscosity, so it feels heavy to write.

The pigment of ballpoint pen ink is dye. There are three main colors of ink: blue, red and black, among which blue ink is the most used. In the past, the pigment components in blue ink were basic blue and basic purple, and the solvents were oxidized castor oil and ricinoleic acid. Basic dyes have been eliminated because of their poor light resistance (light resistance is only 1 -2), heat resistance, acid and alkali resistance and poor durability. At present, the "424" blue ballpoint pen and "322" black ballpoint pen on the market have good durability.

The components of ink are main pigments (pigment components are basic blue and basic violet, and solvents are oxidized castor oil and ricinoleic acid) and viscous substances.