Gray paper is like adding a small amount of black to all kinds of ink, so the color ink with high purity can not be seen visually, showing a dark color. Practice has proved that if other conditions are exactly the same, the brightness of the picture printed on different whiteness paper is completely different. Analyze from the contrast of color and brightness. If only black characters are printed on white and flawless paper, because of the contrast between black and white, black characters are blacker and white paper is whiter,garment measuring tape, forming a sharp contrast, it can be inferred that as the basis of printing, the whiteness of paper is directly related to the bright color of imprints. Similarly, reddish paper makes imprints tend to be red; Cyan paper makes the print tend to be cyan, which needs to be considered when using color. In addition, the absorbency of the paper also has a great influence on the color. The absorbency of the paper will make the pigment together with the binder penetrate into the paper all the time. The tinting strength of color ink, the addition of auxiliary materials in the printing process to dilute the ink color or the addition of auxiliary materials to inhibit drying, and the large amount of ink emulsification may reduce the saturation of printing ink. After printing on the packaging products, the drying is slow, the permeability is strong, and the penetration time is long, that is, the imprinting ink layer is not thick, resulting in the imprinting color is not very bright. 5 Ink layer thickness Whether the thickness of the ink layer is just full is the key factor for whether the color is in line with the original and whether it is bright, which is particularly important when issuing the printing sample. If the thickness of each color ink layer deviates from the original manuscript, it will inevitably distort the hue of the superimposed picture. It is very important to do a good job of controlling the amount of ink in the first color of the basic color. If the foundation is not well laid, it will be difficult to remedy the color in the future. In order to make the hue close to the original, the amount of basic color ink is less, and then the color must be reduced, so that the resulting picture has less ink layers, not bright color at all. On the contrary, if the basic color ink layer is printed too thick, the color will have to follow the thick, if not, the hue will be out of balance. Although the hue of the packaging printing product is close to that of the original manuscript, due to the thick ink layer of each color, the low-tone part is pasted and the high-tone part is flat,large print tape measure, so that the printed picture is dull and dense, and the level is not clear, not to mention the effect of bright color. Source: Printers Return to Sohu to see more Responsible Editor:. tape-measure.com