Blue is a cool color, quiet and clean, and often has the characteristics of reason. Represents tranquility, freshness, coldness, reason, etc. , make people feel lofty, ethereal, silent and noble, away from the secular, pure and detached.

When blue is paired with other colors:

(1) Blue on a yellow background, with no luster.

(2) Blue with green background shows red light.

(3) Blue on a white background, refreshing and clean.

(4) Blue on a black background, with a bright and pure power flash, with high brightness.

In addition, the combination of blue and some cool colors is easy to produce strangeness, emptiness and loneliness.