It is a product of many of society, a variety of products have appeared in people's daily lives, in all aspects of these products plays a different role, there are some people's daily needs products, some of which are in work and study in the desired product, and in these different products, there is a product in people's working and learning are useful, this product is the chalk, which is a special substance created by a product Its main function is to express all kinds of symbols, such as a variety of text symbols, symbols, etc. Another example various markers, which can use chalk to performance.

And precisely because of this function of chalk, in various industries it plays its function. And now, with more and more of its kind, it will use the range more widely, are using it in a lot of industries, it's growing role. That chalk in the end What are the different types of it? But also with the development of its kind and constantly changing society, but also has a very long development process, from the most simple teaching chalk, chalk to today's technology, it's become more and more abundant species, and now it has formed a variety of chalk industry, and these different types, all have in common, but also has the same place, but whether they have a number of differences, their role is one.