Sun-resistant blue B2RL (CAS:4399-55-7) is used for dyeing and direct printing of cotton and viscose fabrics, resulting in red and dark blue. The dyeing rate is good, and the transfer and leveling properties are poor. After dyeing, the color light is slightly green after treatment with fixing agent or finishing by resin. Direct sun-resistant blue B2RL (CAS:4399-55-7) is also used for coloring leather, paper, and soap. It can also be used for dyeing silk and its fabrics, dyeing and printing of viscose and vinylon blends, and viscose blends with disperse dyes.