Use this product to ‘fix’ dyes in commercially purchased solid colored cotton fabrics or clothing to prevent color bleeding during washing. Also use to add washfastness to your own dyeing. Particularly valuable to quilters. Soak fabrics in Retayne before washing them for the first time. Use one teaspoon per yard of fabric in a HOT (at least 140º F) soak for 20-30 minutes, with enough water to cover the fabric, then wash in hot water.