All Zweigart fabrics are used. Each piece is pre-washed. After dying each piece is washed at least twice, but a little shrinkage does occur. No two pieces of fabric will be the same, and slight variations can occur. Dyes used are washable colorfast, and permanent, but slight bleeding can occur when washed, most likely on darker colors. As with all over-dyed and hand-dyed fabric, we recommend that you do not wash the fabric