Sudan IV is primarily used as a dye in various industries due to its intense red color. It is commonly employed in biological staining to identify lipids and fats in tissues, making it a valuable tool in histology and pathology laboratories. Additionally, it is used in the petroleum industry to color hydrocarbon fuels and oils for identification purposes. In the textile industry, Sudan IV is utilized for dyeing fabrics, particularly synthetic fibers, to achieve vibrant red hues. However, its use in food products is strictly prohibited due to its carcinogenic properties.