Rit liquid dye. 236 ml, (8 oz). Use 1 bottle for 2 lbs dry fabric. Double dye quantity for dark or bright colours. Add 1 cup salt to dyebath for cotton, rayon, linens or blends. Add 1 cup vinegar to dyebath for nylon, silk or wool. -NOT recommended for 100% polyester, acrylic, acetate, or fabrics with a special finishes, rubber backing, cold water wash, or labelled dry clean only. Rit has a line of dyes for synthetics called DYEMORE.