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In order to achieve more expressive design effects, designers and packaging printers often need some spot color printing processes in the packaging printing process. The most common gold and silver printing.
Gold spot color printing
Gold and silver inks are not referred to as gold or silver for short. They are metallic inks, which are distinguished by elegance and color saturation, and are widely used. There are two main components of gold and silver inks: pigments (colors) and binders (adjusting oils).
The pigment in gold ink is commonly known as "gold powder", which is actually a scaly powder made of copper and zinc alloy in a certain proportion. If the copper content in the gold powder is above 85%, the gold ink is reddish, and it is customarily called red gold; If the zinc content is between 20% and 30%, the gold ink color is greenish, which is generally called cyanine; the one between red gold and cyanine is called cyan red gold.
The pigment of silver ink is aluminum powder, which is composed of 65% flaky aluminum powder and 35% volatile hydrocarbon solvents. The proportion of aluminum powder pigment is relatively small, and it is easy to float in liquid. The linking material used is a special kind of ink. Generally referred to as gold or silver oil, the main ingredients are oil, resin, organic solvent auxiliary materials, etc.
Due to the unique metallic luster of gold and silver inks, it has been occupying an important position in the printing industry for many years. Gold and silver ink printing has also been continuously innovated in technology. The gold is magnificent, elegant and luxurious, adding joy and gorgeousness to printed matter The atmosphere of elegance. Silver's elegant elegance has also been sought after by more designers and businesses. Commonly there are full version of gold or silver, partial gold and silver combination, gold and silver as the background color overprint four colors. Used in picture albums, gift packaging, tea boxes, greeting cards, business cards, hardcover books, wall calendars, desk calendars, etc.
In the printing process, the printing of gold and silver is actually difficult to control the quality of the finished product. First, the particles of gold ink and silver ink are thicker than other ink pigment particles, which causes poor adhesion between paper and gold during printing. The slight oxidation of the conjunctival reaction affects the adhesion of the ink. During the drying process, pigment particles are easily precipitated from the binder, resulting in inadequate adhesion. If other colors of ink are imprinted on gold or silver ink, due to its own properties The reason is that it is easy to stick the bottom ink away, and the printing is not true or appears white.
What needs to be added is that there is a difference between gold and silver printing and bronzing. Gold printing only requires a single set of film, indicating the spot color, and the spot color channel can be printed normally. Hot stamping requires not only a single set of film, but also a hot stamping plate. We won't go into details.