Ink basic knowledge: Hue hiding power and tinting power

Any color is represented by the three characteristics of hue, lightness and saturation, so the above three factors must be considered in the color matching process. Although black is theoretically a complete absorption of light, black ink still has gloss. The screen printing ink is grinded by pigment (toner) and resin binder. The particles of pigment are surrounded by a layer of nearly transparent resin oil. This layer of resin oil has the effect of refracting and reflecting light, so we can feel the black ink Printed on the substrate still has a certain gloss. In the ink color matching process, the ink used should be determined according to the actual printing process, ink layer thickness, printing substrate and other conditions. When choosing an ink, consider the gloss, hue, tinting power, and hiding power of the ink itself.

1. Gloss can be measured with an instrument or judged with the naked eye. Usually, it is only observed with the naked eye during the color matching process. Gloss actually refers to the degree of the ability of an ink printed sample to reflect light in the same direction after being illuminated by light. It directly affects the appearance of printed matter and is a very important indicator. At the same time, when selecting the ink, it is necessary to distinguish whether the ink itself is bright, semi-gloss or matte type ink to avoid mixing errors.

2. Hue is the basic characteristic of color, used for qualitative distinction. When matching colors, we must first consider whether the hue is consistent. The detection method is usually to scrape the color through scraping paper or simulate printing, and observe and compare the standard sample and the sample with human eyes.

3. The hiding power is the degree to which the ink covers its background color. The better the hiding power, the worse its transparency. The level of transparency affects the efficiency of ink chromatism and the degree of influence of the printing substrate.

4. Coloring power is a method of indicating the level of ink concentration. Its measurement is based on the method of comparing a certain amount of ink with a certain amount of standard white ink and then diluting and mixing with a standard sample. The difference in color strength reflects the degree of color mixing of the ink and affects the thickness of the printed ink film.

Drowdown test can be done through color identification of scraped paper to compare the difference in gloss, hue and hiding power between the ink sample and the standard sample. Specific method: put the standard ink in the upper left corner of the identification paper and the color matching ink in the upper right corner. The distance between the two is about one centimeter. Use a spatula to flatten the thin part at a nearly perpendicular angle to the scraped paper and lightly at an oblique angle. Force to quickly expand the thick part.

After the ink surface is dry, you can observe the hue of the ink in the thin part, identify the hiding power and transparency of the ink in the black belt, judge the difference in gloss between the two in the thick part, and observe the appearance of the entire color. Usually black and color inks use white scraped color paper, while white inks use black scraped color paper.

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