Gold ink lack of remedies

As we all know, the main ingredient of gold ink is copper powder. The chemical properties of copper powder are lively, and acid, alkali, carbon dioxide, sulfide, etc. will produce different degrees of chemical changes and turn black. Jinmolu's copper powder is scale-like, with characteristics such as graininess and buoyancy. The uniformity of the distribution in the binder and the fixing force on the surface of the printing ink are poor. In the drying process of the ink, it is easy to connect It separates and adheres to the surface of the ink layer in a granular form, and emits gold light upon irradiation with light. Obviously, the copper powder exposed on the surface of the ink layer is susceptible to tarnish or blackening and darkening due to air oxidation or other chemical elements. In particular, some of the finer line patterns, because the use of ink is very small, the effect of printing is even more obsolete, dark and unsatisfactory. Can you try to make up for this deficiency? We conducted a trial.

Printing a book cover designed with gold ink lines, due to the fine lines, coupled with the ink itself is easy to oxidize, so simply printed with gold ink, will appear dark, lack luster, does not meet the original. After analysis, we found that in dark tones, there seems to be a lack of yellow brightness. Therefore, we added a little yellow ink to the gold ink, and it was printed with a golden yellow color, and it greatly enhanced the uniformity and anchoring power of the gold ink. Compared with the original, no less.

We believe that although the main component of gold ink is copper powder, it will be separated from the link material during the drying process, and the amount of ink will be less and the oxidation will be easier. However, adding a little yellow ink can make up for the deficiencies and does not affect its external quality. Of course, this method is only effective for those fine gold patterns.