Each skein is one of a kind. All yarns are treated with a mordant to insure the dyes last. We use alum and sometimes iron as our mordants. Some natural dyes are more long lasting than others. We avoid the more fugitive natural dyes as they tend to fade in the sun quickly or lose their colour with time. All naturally dyed fibres will fade a bit over time so we recommend that you store them out of the sun and hand wash in cold water.