Why are the liquids in advertisements for sanitary napkins and diapers all blue = =?

Because blue is the most comfortable and acceptable color for human eyes, and psychologically speaking, sky blue, like pink, is a "soothing color" and a quiet and relaxed color. Blue represents tolerance and love.

Blue is a broad color, and the vast scenery of the sky and the sea is blue. Blue is the symbol of eternity and the coldest color. Pure blue shows a kind of beauty, gentleness, reason, peace and cleanliness.

Blue has a rational and accurate image because of its calm characteristics. In commercial design, most commodities or corporate images that emphasize technology and efficiency choose blue as the standard color and corporate color, such as computers, cars, photocopiers and photographic equipment. In addition, blue also represents melancholy, which is influenced by western culture. This image is also used in literary works or commercial designs with emotional appeals.

Blue has a wide range of uses. Blue can calm the mood. Sky blue can be used as decoration for hospitals and sanitary facilities, and also as clothing and curtains in summer. Generally speaking, painting and various ornaments are also inseparable from blue.

Different combinations of blue and white are bright, refreshing and clean; Blue and yellow collocation, big contrast, big brightness; Large pieces of blue generally do not match green, but can only penetrate into blue-green, lake blue or cyan, which is also an intoxicating color; The combination of light green and black is solemn, mature and educated. Deep blue can't be matched with crimson, purplish red, dark brown and black, because it has neither contrast nor lightness, only a feeling of being stolen.