Knowledge

Non-toxic chalk: It is the healthiest chalk among the chalks. It is made of pure gypsum and water, solidified and dried, and edible gypsum is used.

Dust-free chalk is an improvement on regular chalk, designed to eliminate chalk dust pollution in classrooms.

The earliest humans discovered that charcoal could be used for painting. Long before the invention of writing, humans used charcoal to paint. Toner or charcoal murals can still be seen in European cav

Chalk is a widely used tool in daily life, generally used for writing on blackboards. Ancient chalk was usually made of natural chalk, but nowadays it is replaced by other substances.

Assembly machines, China only produces single machines, with low processing accuracy and efficiency.

The versatility of the ink should be strong, which can not only cooperate with the pen head more widely, and achieve better writing performance, so as to better become the supporting product of the pe

Although neutral ink pens belong to the same category of ballpoint pens, their writing principles, pen head structure, and processing technology are similar to those of traditional oil-based ballpoint

Lithium-based ester is an organic material located at the end of the gel pen and used to seal the neutral ink in the ink tube.

Keep a good moisturizing seal to prevent the ink from evaporating or overflowing.

Gel pen, short for neutral ink ballpoint pen, originated in Japan and is a novel writing tool popular in East Asia.