Red and blue design taboos

Quick answer：

Red and blue are commonly used in design, but there are certain taboos. For example, red and blue are often avoided in combination in Western cultures as it can be associated with disharmony or conflict. In Chinese culture, red and blue together are sometimes avoided because of their symbolic meanings. Red symbolizes luck and joy, while blue is associated with sadness and solitude. Designers should consider cultural contexts and color psychology when combining these colors.