The pigment used in metal printing ink is mainly aluminum paste, aluminum powder, bronze powder and other metal pigments. Then we know that aluminum powder is very active, and  it will produce some series of chemical reactions when touching water. So many times, The existence of moisture printing ink itself and printing construction is a great impact.

Here, the main analysis is oil based ink and oily aluminum paste, because different ink systems are affected by different systems. In the production of conventional metal inks, the resin and solvent in the ink system will adsorb a lot of moisture, and the aluminum silver pulp will also absorb a large amount of moisture in the production of the conventional metal ink. It is black on the color of its own ink, and its brightness will decrease. It will also cause the phenomenon of barrel rising after packaging, which will seriously affect the quality of products.

If the metal ink is used in this kind of quality problem, there will be a large number of pores, drawing, and partial silver dropping. Even if the ink itself has no quality problems, the substrate is damp in the high temperature and humidity environment in summer and the surface of the substrate is condensing water, especially in rainy days, film, and 
iron printing surface. The effect of condensed water on printing is very great.