Meihua brand fountain pen.

The fountain pen is a widely used writing instrument and was invented in the early 19th century. The pen head is made of metal, and it is smooth and elastic when writing, which is quite smooth. There are obvious trademarks, brands and models on the mouth of the pen cover or on the surface of the pen tip.

A fountain pen is a writing instrument that mainly uses metal as the pen body. It contains ink (mostly black or blue) through a hollow pen tube. Through gravity and capillary action, it passes through a duckbill. The handwriting has different weights when writing. It can be said to be the writing tool of Western calligraphy. The ink in most fountain pens is refillable, usually using an eyedrop vial or a straw to refill the ink. The earliest historical records of water-filled fountain pens date back to the 10th century, and this earliest water-filled fountain pen was used until the 18th century. Development was slow, however, until the early 19th century, when a fountain pen with a steadily accelerating flow was invented during production. Only three key inventions made the fountain pen a widely popular writing instrument. These inventions were: iridium gold nibs, hard rubber, and free-flowing ink.

Principle of ink absorption

After squeezing out the air in the pen bag, the air pressure in the pen bag is less than the outside air pressure, and the outside air pressure squeezes the pen water in.