The taboo of blue characters on white background mainly exists in some specific occasions or uses, such as avoiding using red and white when writing other people's names, using gold or silver or black when signing in for activities, and using black when inscription to show respect or attention, and not using other colors.

In some specific occasions or use, there are certain rules and requirements for color, in order to achieve certain visual effects, convey specific information, or express specific feelings and values.

However, the specific color matching and regulations will be different due to factors such as culture, region, customs and religion. , but also according to the specific situation to judge and choose.