Mordant Orange 1 is primarily used as a dye in the textile industry, particularly for coloring wool, silk, and nylon. It functions as a mordant dye, requiring a metal ion, such as chromium or aluminum, to form a stable complex with the fabric, ensuring long-lasting and vibrant colors. This dye is valued for its ability to produce bright orange hues, making it suitable for applications where colorfastness and durability are essential. Additionally, it is sometimes employed in biological staining techniques to highlight specific structures in microscopic analysis and as a pH indicator with a transition interval of 10.0-12.0 for alkaline conditions. Its use in industrial dyeing processes is favored due to its resistance to fading from washing or exposure to light.