RIT works best on many natural, washable fabrics such as...

• 100% cotton, linen, silk, wool, ramie
• Synthetics such as rayon, nylon and acetate
• Fiber blends with at least 60% cotton or other dyeable fiber (Blends will tint evenly but will not achieve full color)

...but there are fabrics that will not accept dye such as...

• Fabrics with 50% or more polyester content
• 100% acrylic, fiberglass, or metallic fibers
• Fabrics with rubber backing (bath mats or throw rugs)
• Fabrics with special finishes such as water repellents
• Fabrics with bleach damage or extensive staining
• Fabrics washable only in cold water or labeled "dry clean only"

If you are in doubt as to whether your fabric will accept dye, test a swatch.