Many customers will choose silver and gold ink printing in order to pursue beautiful appearance, but in the process of design, we should design the layout rationally according to the characteristics of art paper and printing process, not only to be beautiful and generous, but also to fully consider the characteristics of gold and silver ink and printing process requirements, so as to prevent printing defects that should not occur as far as possible. Gold and silver ink is an ink with high concentration of gold and silver by replacing pigment particles with gold or silver particles (usually copper, aluminium powder or copper, aluminium thin film). The greatest characteristic of gold and silver ink printing is that it can show the suspension and color formation of gold and silver powders after printing. It can ensure the stability of quality and color stability in storage. Gold and silver ink printing should be selected according to the characteristics of art paper. Generally speaking, gold and silver ink should be used on the local or color block in the field, while it is better not to design into gold or silver for very small script, positive script or level transition.
In the process of plate-making design, we should consider the color sequence arrangement of gold and silver inks to ensure the metallic color. Also think about the request of gold and silver ink printing for art paper. If the art paper absorbs ink very strongly, the linking material will be absorbed quickly, and the metallic pigments in the ink will float on the surface of the art paper, lose lustre, not firm enough to adhere, and even will fall off. The strong acidic art paper is easy to react chemically with metal powder, resulting in discoloration of metal pigments and loss of luster. When printing gold and silver ink on art paper, we should first lay the base color ink, for example, when printing silver ink, we should first lay a light white ink, which can not only improve the gloss of silver ink layer, but also enhance the adhesion of silver ink on paper. After printing gold and silver inks, some products should also consider UV or water-based polishing, or film coating, in order to avoid metal pigments oxidative discoloration or scattering.
Gold and silver ink printing requires special printing process. The durability of gold and silver ink is generally worse than that of pigment particles, but it can be maintained by using printing coating or polishing layer. Inks made of powdered metal pigments tend to thicken (thicker) on the printing press, whereas inks made with wet gold and silver paste pigments are better. In printing, gold and silver inks have the characteristics of low viscosity, suitable for transmission between ink rollers, making the printing process comparatively clean. For prints, rough art paper prevents fine gold and silver ink particles from forming metal foil on the surface of the paper and reduces the printing effect of gold and silver ink. In addition, the use of gold and silver ink printing is mainly to highlight its metal characteristics, because the opacity of other inks will affect its metal effect, so in the layout of printing color sequence, the general request for gold and silver ink in the final printing. As the opacity of gold and silver ink will lead to excessive compensation of ink, as long as more ink is used to achieve the ideal metal effect, but this will lead to ink imbalance, bring too much burden to the printing system, causing paste and dirty and other problems. The best way to avoid these problems is to add ink to a lighter color image so that it just covers up the image. Then, increase the amount of ink and adjust the water supply to make it slightly higher than the minimum value, so as to prevent non-graphic local ink. In order to make the gold and silver inks have good printing adaptability, the selected toner oil (gold and silver toner) must ensure adequate viscosity, good chemical stability, good transparency, good dryness and poor solidity, ensure that the toner oil and gold and silver powder can be mixed equally, and can improve the color performance of gold and silver powder. Metal luster and colouring can be stronger.
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