What color is better for the cover of security photography products? Give me some advice. I just want to refer to it

With blue, the blue with low lightness symbolizes solemnity and sublimity, and the color has cold and solemn psychological association.

Blue, the color of the sky, looking up at the vault, is blue, and the endless sky seems to be covered with a pool of green ink, which has been traced back to the horizon; Blue, the color of the sea, layers of blue waves come and go, just like thousands of blue war horses galloping and screaming. In the slow sea breeze, pieces of blue are flying in front of my eyes.

Blue symbolizes profundity, and the blue sky in Wan Li is boundless, leaving people with endless mystery. This is an unknown field waiting for us to explore and discover.

Blue symbolizes hope. Isn't that what we mean? A beautiful blueprint is presented to us. We should learn to grasp it, pursue our dreams, let them fly, set great ambitions from the bottom of our hearts and sprint towards our great cause.

Blue. Symbolizing freedom, rolling waves wander around freely, looking for sincerity, happiness and endless fun in that beautiful space of their own.

Blue symbolizes free and easy, so why not stop at the section, live with an elegant and elegant heart, give the soul a pure land, and give the soul a comfort.