Acid Orange 7, also known as C.I. 15510 or Acid Orange II, is a synthetic dye that has been used in the textile industry. It is part of the azo dye class, which is known for its vibrant colors and easy application to various materials. The role of Acid Orange 7 in the textile industry is primarily as a dye for coloring fabrics.

Here are some key points about the use of Acid Orange 7 in textiles:

1. Dyeing: Acid Orange 7 is commonly used for dyeing natural fibers such as cotton, silk, and wool. It is particularly effective in dyeing protein-based fibers like silk and wool due to its affinity for these materials.

2. Color: Acid Orange 7 produces a bright orange color, which can vary in shade depending on the concentration and application method. The dye's colorfastness is generally good, meaning it retains its color during washing and exposure to light.

3. Compatibility: Acid Orange 7 is primarily used in acid dyeing processes, where the pH of the dye bath is acidic. This is because the dye has a negative charge and is attracted to the positively charged fibers in an acidic environment.

4. Application: Acid Orange 7 can be applied to textiles through various methods, including immersion dyeing, padding, or printing. The dye is soluble in water, making it easy to prepare dye baths for the dyeing process.

5. Other uses: Besides textiles, Acid Orange 7 has been used in other industries, including food, cosmetics, and pharmaceuticals, albeit in smaller quantities.