... High washing fastness4) Usage: Mainly used in dyes for wool and leather, etc. Index No.:Acid Orange 7 ... , a generic acid dye, is commonly used for the high temperature dyeing of wool in strong ... and crosswoven fabric in formic acid bath, and for direct printing on wool, silk or nylon 6 fabrics. It ... can also be used for dyeing on leather, as indicator, or for ...