The dyes used in these fabrics are reactive dyes; therefore, colors are stable and will not release any excess dye. Prewashing fabric is not necessary. If you choose to prewash, wash in cold water and damp dry. Complete the drying process by air drying. This washing and drying method will retain the finish of the fabric and will meet standards of quilters who do not wan to prewash fabrics, and those who do.