Cosmetics are mostly consumer goods with high added value, and the appearance image of products has a great impact on the psychology of buyers. Therefore, cosmetics manufacturers usually make cosmetic packaging box very beautiful, thought-provoking. Of course, this also puts forward higher requirements for high-end cosmetics packaging box printing factory, ink factory and other supporting products production enterprises. It can be found that a considerable number of domestic cosmetics packaging has reached a relatively high level, which is not inferior to similar products in developed countries. This is the result of hard work and continuous progress of the industry. It is also inseparable from the close cooperation and highly responsible attitude of relevant enterprises. The pearl effect of packaging is playing a very important role in the field of cosmetics packaging.

           In the high-grade cosmetics packaging, the role of pearlescent effect has gradually been paid attention by more and more people in the industry. According to our analysis, the reasons are as follows:

(1) The soft and deep luster accords with the traditional aesthetics;

(2) The design method is flexible and varied with rich forms;

(3) The printing operation is simple and can meet the requirements of high-speed packaging printing.

             For paper packaging with pearlescent effect, most cosmetic manufacturers are not unfamiliar, but some specific problems, such as "how to produce pearlescent", "how to use pearlescent", "how to use pearlescent" are not understood by many people. Through the following introduction, we hope to make you have a deeper understanding of pearlescent packaging.

（1） How do pearls come into being?

            In packaging and decoration, there are means of expression that emphasize strong, warm colors and luster: for example, western modern style paintings or African and Latin American traditional sentiment, or the design of Peking opera costumes, using bright and showy materials and various bright colors; on the other hand, there are also implicit and introverted ones, Simple, light, magnanimous and peaceful: the aesthetic feeling of jade, pearl and porcelain shows such an attitude. The color is elegant and harmonious, and does not constitute conflict or contrast. In terms of luster, it is not sharp but soft, deep and steady. This is a kind of "quiet".

Using ink to make this kind of luster on the package represents a kind of idea. Using artificial technology, pearlescent printing can paint ordinary paper with elegant luster, and with different design styles, it can express elegant aesthetic taste. And this taste is in line with cosmetic products.

           In terms of luster intensity, pearlite is not as eye-catching as metallic luster, but it is more of a kind of warm and soft mood. In short, this is an optical interference phenomenon. The light passes through several translucent layers, each of which is refracted. The "interference" between these refracted rays forms the so-called pearlescent light.

It can be seen that this "luminous" form leads to two characteristics of pearlescent ink

(1) introverted and deep sense of texture and thickness;

(2) uncertainty of position.

          Traditional ink pigments, whether organic complexes, inorganic salts or metal pigments, do not have these characteristics. Therefore, pearlescent pigment is defined as an independent kind of light and color expression materials

            With the development of technology, the variety of this kind of pigment is gradually enriched. For example, Merck iriodin200 series products can "control" the interference of light by precisely controlling the thickness of titanium oxide layer on mica to form the alternating change phenomenon of complementary colors; ir.221 products, observed from most angles, are light yellow; when turned to a certain angle, it shows light blue luster. The dynamic change brought about by this contrast is called "flip - flop effect".

            Due to the unique translucency of pearlescent pigment, it can be used in harmony with traditional colors, so that it can evolve a richer color. Sometimes it can be used to increase the depth and level of a certain color; sometimes, new elements can be added to the original color. As a member of the international popular color organization, Merck uses iriodin pigments to interpret the annual popular colors released by the organization, giving new vitality to product packaging.

  (二) How to use pearlescent printing?

              In cosmetics, there are a lot of printing cosmetics packaging with pearlescent style. There are not only hard / cardboard outer packing boxes, labels made of coated paper, but also plastic flexible packages printed in pearlescent color, and flexible tubes printed with pearlescent patterns. These forms are often completed by different printing methods, and there are great technical differences between them. We can't solve all the problems with one solution simply. Because of the space, we can't explain various printing methods here. However, there are some basic principles that we can understand. For example, one of the most important elements in evaluating the effect is the pearlescent luster intensity. In printing, this is mainly related to two factors: the quantity of pearlescent pigment and the arrangement of pigment particles. The former is easier to understand, the more pigments in the ink layer, the better the effect (of course, the more the gloss will not increase after reaching a certain degree); the latter means that if the pigment particles can be parallel arranged along the substrate surface, the reflected light intensity is the best; similarly, the smoothness of the substrate surface is better,

              In addition, when using pearlescent pigment to blend printing ink, ink blending oil with good transparency should be used. Otherwise, after a large amount of incident light is absorbed in the ink layer, the reflected light will be weakened

For different material cosmetics packaging products, considering the adhesion and operability of ink, we will choose different printing methods.

              Manufacturers need to consider the product situation, packaging equipment, cost and other factors. Of course, from the cosmetic packaging, the visual effect and style is the first.

  (三)How to use pearlescent pigment well?

             How to launch the next generation of products? How to plan the appearance of cosmetic packaging box? This is a big problem for manufacturers at present. Moreover, the larger the enterprise scale, the higher the brand positioning, the more cautious we should treat it, the more difficult the cosmetics packaging design will be. On the other hand, the fierce competition in the market can't tolerate any slip ups and downs, and it's hard to find it back once the opportunity is missed.

              There are many powerful and unique manufacturers trying to get rid of the embarrassing situation and develop packaging in a systematic and efficient scientific way, which is the inevitable orientation for survival and development in this industry.

             From the perspective of high-grade decorative raw materials, pearlescent pigment is such a product, which has wide adaptability, stable performance, and can provide a lot of optional.

              "Pearlescent pigment" in the traditional sense refers to the white pigment that provides a soft and delicate pearl effect. But in fact, the pigment made from mica is not limited to this. Merck's conventional iriodin pigments can be divided into four categories in terms of color and five grades in terms of thickness. There are not only different colors, but also great differences in covering power and gloss characteristics. In foreign countries, the incomplete definition of "pearlescent pigment" is gradually replaced by "special effect pigment".

What's so special about pearlescent pigments?

           First of all, pearlescent is a kind of visual effect with depth and layering. The luster we observed is formed by multiple refraction of incident light in pearlescent coating. Therefore, the pearlescent coating shows a pearl texture and positional uncertainty.

   Secondly, pearlite is translucent. Apart from pearlescent pigment, there is no other color forming material, which can not only have translucent "body bone", but also perfectly show the light and color effect. For this reason, pearlescent pigments can be used with other pigments to create more and more fresh visual effects. There are two common color combinations:

             (1) separate pearlescent coating is superimposed with conventional pigment coating. When the pearlescent color is above, it can show some of the color light below, and the glossy effect is best displayed. When the "iridescent interference color" pigment is covered on the dark color background, its refractive color changing characteristics and the background color will merge into a kind of faint color, full of mystery. When pearlescent color is below, it seems to form a layer of high brightness background color, adding saturation to the color above.

  (2) pearl color can be mixed with conventional color. This combination also highlights the color saturation of pearl luster. It should be noted that the pearlescent effect belongs to the soft luster with low reflection intensity, and excessive concentration of mixed color will cause gloss loss. Therefore, we suggest that the transparency of the mixed color should be better, and the addition amount should not exceed 3%. In addition, pearlescent pigment has the effect of light color change: here, it refers to the "Rainbow interference color" pigment with "switching effect", such as iriodin 200 series products. As mentioned in the above article, I will not repeat it here.

              In order to describe the product more vividly and promote its application, the relevant marketing staff analyzed and classified the characteristics and application concept of pearlescent pigment, which can be regarded as a combination of inspiration and experience

  (1) soft & care: elegant and delicate silk luster formed by fine-grained pigments.

 (2) young & fresh: refers to the fresh, bright and dynamic expression provided by medium or fine particles of pigment.

  (3) deep & rich: it refers to the color intensity and harmony formed by the effective combination of pearlescent and conventional colors, so as to express the introverted and noble quality

  ( 4) Aesthetic&Functional : The relationship between high-tech products and aesthetics can be redefined by using soft titanium pearlescent luster.

             Through the use of large areas of pure pearl color can express elegant style, we all have a consensus on this point, if we have a deep understanding of the nature of this material, we may play its unique creativity, show brilliant ideas. For example: Shiseido skin cream packaging box is a good use of pearlescent pigment to show the typical case of product style.

            Pearlescent effect is not uncommon in cosmetics packaging, but it is mainly based on light color, lack of further changes, some of the same. This box is a little different. The light yellow color is rendered on the pearl light on the surface. This collocation complements each other and adds a few natural feelings to the overall style. In addition, the UV type local glazing oil is used to make the moist pearl surface appear a wave pattern with decorative charm, which enriches the visual experience. Although the color box of cosmetic packaging is small, it is worthy of a big design