Acid Black 24 is primarily used as a dye in the textile industry for dyeing natural fibers such as cotton, silk, and wool. It is commonly applied in the following ways:

1. Exhaust dyeing: Acid Black 24 can be applied to textiles through exhaust dyeing. In this process, the dye is dissolved in water along with auxiliary chemicals like leveling agents and pH modifiers. The textile material is then immersed in the dye bath, and the dye is absorbed by the fibers through a combination of diffusion and ionic attraction. The dyeing process is typically carried out at elevated temperatures, often with the aid of agitation.

2. Pad dyeing: Acid Black 24 can also be applied through pad dyeing, a method commonly used in continuous processing. In this process, the dye is padded onto the textile material using a roller or padding machine. The excess dye is then removed, and the fabric is dried and subsequently steamed or cured to fix the dye.

3. Printing: Acid Black 24 can be used for printing patterns or designs on textiles. It is typically used in combination with other dyes to achieve the desired color shades and effects. Various printing techniques such as screen printing, roller printing, or digital printing can be employed, depending on the specific requirements.

4. Other applications: Acid Black 24 may also find application in other industries, such as paper, leather, and ink manufacturing. In the paper industry, the dye can be used to color paper products. In the leather industry, it can be employed to provide shades to leather goods. In the ink industry, Acid Black 24 may be used as a colorant for printing inks.