Liu Rongbiao flagella staining solution is primarily used in microbiology for visualizing bacterial flagella under light microscopy. It enables researchers to observe the number, arrangement, and distribution of flagella on bacterial cells, which is critical for bacterial identification and classification. The staining solution is especially useful in studying motility-related characteristics of bacteria in research and educational settings. Its application supports detailed morphological analysis, aiding in the differentiation of bacterial species based on flagellar patterns.