The taboo of using blue characters on a white background mainly exists in some specific occasions or uses. For example, avoid using red and white when writing other people’s names, using gold, silver or black for signatures when signing in at events, and using Chinese characters when writing inscriptions. The words should be in black to show respect or attention, and no other colors can be used.
In some specific occasions or uses, there are certain regulations and requirements for color. This is to achieve certain visual effects, convey specific information, or express specific emotions and values.
However, specific color matching and regulations will vary depending on culture, region, customs, religion and other factors, and judgment and selection need to be made based on specific circumstances.