1.       The first is printing ink, the reason of toxic chemical composition, because the ink exist including lead and heavy metals.

2.       Followed by education version fluid, education version of liquid role is to guarantee the print-ersion blank forming hydrophilic salt layers of necessary conditions, but education version, there is also a fluid called isopropanol chemical composition, the chemical volatilize to generate some alcohol steam gas, can according to the human body into harmful effects.

3.       The last one is have protection and increase sheen of plastic film, but like plastic bags as it cannot degradation and become white pollution, and in the process of using toluene coated, omg water poisonous volatile solvent, such as human body will be paired hazard and environmental pollution.

   Note: this is just one of several, but as long as we usually pay attention to the next, the harm to human body still can relieve；