What does it mean when says this material may crock?

"Crocking" refers to the transfer of colour from a fabric or material to another surface, such as skin, clothing, or upholstery, when rubbed or subjected to friction. It occurs when loose dyes or pigments on the fabric are not properly fixed during the manufacturing process, allowing them to be transferred onto other materials. Materials prone to crocking are often described as "colourfast," meaning they may lose colour when exposed to moisture, abrasion, or wear.

To avoid crocking, manufacturers may apply special treatments to the fabric, such as colour-fastening agents or resin finishes, to improve colour retention and prevent dye transfer. When shopping for fabrics or garments, it is advisable to check for labels that indicate whether the material is colourfast or may crock to ensure proper care and avoid damaging other items.