What's the saying about black words on a red background?

1. Red is associated with danger, warning and alert in many cultures. Black characters on red background are often used in warning signs, warning slogans or other occasions that need to be alert and aware of danger, such as traffic signs and fire signs, so as to attract people's attention more easily.

2. In some traditional cultures, red is a symbol of auspiciousness, celebration and blessing. In special occasions, such as festive activities or celebrations, the design of black characters on red background is often used in slogans, banners, promotional materials, etc., to express the atmosphere of blessing and celebration.