【How-to】Do you need soda ash for tie dye

Soda Ash is also very hard on these fabrics, so use half as much, and don’t cure for more than 4-6 hours, or use the vinegar / microwave method instead of using Soda Ash. It is always good to pre-wash your fabric and garments; fabric softeners, oils, and other finishes can prevent the dye from absorbing into the fiber.