We can reveal or reflect the items in the inner packaging through the color of the outer packaging box, so that people can basically perceive or associate the inner packaging when looking at the outer packaging box. However, if we can go into the store to see the goods, many goods fail to reflect this caring relationship, so that consumers can't think of what the packaged goods are from the outside to the inside. Of course, it will not play a positive role in promoting the sales of products. The color of the normal outer packaging bag should grasp such a same feature in different degrees. What characteristics should be grasped in the design of packaging box?

(1) From the perspective of industry, the normal colors of food are goose yellow and pink, which gives people a warm and intimate feeling. Of course, there are many kinds of tea, drinks, green and blue, wine and cakes, and children's food. Most of the daily cosmetics are rose red, pink, light green and light blue.

(2) Color contrast (or depth contrast) is also one of the important reproduction techniques in packaging color application. This light and heavy contrast often sets off a dignified and deep theme pattern (mainly color block patterns) on an elegant background or in a dignified and deep theme pattern. It shows the theme and name of light and elegant packaging, as well as trademarks or advertisements. In turn, there is a large area of dignified and deep pigments to lay the foundation. In addition, some patterns are decorated with elegant tones or concentrated in a certain color block or comprehensively. In this light and heavy contrast, general pigments have coordinated color contrast and cold and warm color contrast, and the method of coordinating color contrast is often light green to dark green; Light yellow to dark coffee; Pink is red, while the contrast between cold and warm colors is mostly black and white, red and blue.

(3) Point-to-surface ratio (or size contrast) of color application mainly refers to the contrast of pigments from a center or concentrated point to the whole picture in the design process of a packaging picture, that is, the contrast between a small-scale picture and a large-scale picture. In daily life, especially when washing cosmetics, we can see that there is nothing clean on the packaging box of a product. There is a very obvious small square (or oval or small circle) in the middle, and then the theme of the brand and name of the packaging content is reflected from the picture of this small square, which is not only a combination of point and surface, but also a comparison of size, and occasionally a comparison from point to point.

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