13+ YEARS 

A catalyst refers to a substance that can change the reaction speed in a chemical reaction, but its composition and quality remain unchanged after the reaction. The catalyst that accelerates the reaction is called a positive catalyst, and the one that slows down is called a negative catalyst or retarder. 

Dyestuffs refer to organic substances that can color fibers and other materials firmly. There are many types of dyes, which can be divided into natural dyes (such as vegetable dyes, animal dyes, mineral dyes, etc.) 

Organic raw materials are petrochemical industries that use petroleum and natural gas as raw materials, and use grain fermentation to produce alcohol or solvents. 

Plant extracts refer to substances extracted or processed from plants (all or a part of plants) using appropriate solvents or methods. They can be used in the pharmaceutical industry, food industry, daily chemical industry and other industries.