... -2 level dyeing fastness, light fastness was 2-3 grade acrylic fiber. Usage: 1. Basic violet 5BN and can be used for ... dyeing silk, cotton, hemp, acrylic fibers, but the fastness is poor, so the application has ... and so on, can also be used for dyeing cotton, acrylic, silk, paper, leather, grass products, but also can manufacture Lake ...