Oxidation reaction: The composition of printing ink, there are many drying agents, antioxidants and other additives in the ink, which will not be oxidized after drying. Ink is a homogeneous mixture consisting of colored bodies (such as pigments, dyes, etc.), binders, fillers (fillers), additional materials, etc.; can be printed and dried on the body to be printed; it is colored and has a certain flow Degree of paste adhesive. Therefore, color (hue), body bone (thickness, fluidity and other rheological properties) and drying performance are the three most important properties of ink. There are many types and different physical properties, some are thick and sticky; some are quite rare. Some use vegetable oil as the linking material; some use resin and solvent or water as the linking material. These are determined according to the object to be printed, namely the substrate, printing method, type of printing plate material and drying method. Therefore, the printed part of the surface of the gift box will change color after a long time, one of the reasons is that the printing ink has not reached the standard.

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