In tinplate printing, white-based products account for the majority of the printed iron, and white-based products actually simulate the effect of paper white.
As far as the currently used white sets are concerned, basically none of them are naturally white, and all have color casts. For example, the yellow phase can be dyed, the red phase can be dyed, the blue phase can be dyed, the red-blue phase can be dyed, the purple phase can be dyed, and each whiteness of white can be dyed.
These factors determine that the different hues of white and white will have different effects on the hue of tinplate printing spot color inks in the mixing of spot color inks.
For example: printing warm colors on bluish or bluish-red shades will print darker than the ink itself; printing on yellowish tones will print more yellow than the ink itself.
When the red phase spot color ink is printed on its complementary color-blue phase, both blue-red phase and purple phase can be printed, and the printed color will be darker than the ink itself; the complementary color-red of the green phase spot color ink can be very small;
Tinplate will print darker than the ink itself when printing on blue, blue-red, and violet; blue-phase spot inks can be printed on their complementary colors - when printing on yellow, the printed color will be darker than the ink itself. The ink itself is darker.
Tinplate printing gold and silver ink is colored by gold, aluminum and other metal powders: after gold, silver ink or metal spot color ink and gold and silver ink are mixed and oxidized, the color change printing iron gold and silver ink is colored by gold, aluminum and other metal powders.
Among them, the gold ink for metal decorating printing is the printing ink prepared by grinding copper powder; and the silver ink for iron printing is the ink made by grinding aluminum powder. The chemical properties of gold and silver powder in gold and silver ink for printing iron are generally not stable enough.
When they encounter acid, alkali, water vapor, sulfide gas and carbonic acid gas, a chemical reaction occurs, which makes the ink color of tinplate prints lack metallic color.
The regularity of metal discoloration is from golden yellow to reddish brown to black. Because copper will form red cuprous oxide during initial oxidation, and will become black copper oxide after further oxidation;
In addition, under the process conditions of high carbon dioxide gas and high humidity, the gold powder is likely to become basic copper carbonate. Therefore, the gold ink printed on tinplate gradually becomes darker. After the silver ink changes, it becomes gray and lacks the silver metallic texture.
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