Abrash refers to the faint striping or colour variation sometimes visible in a handmade rug, usually running across the width in subtle bands. It happens because yarn is dyed in batches by hand, and even careful dyeing produces small shade differences from one batch to the next — when a weaver runs out of one dye lot partway through a rug and starts the next, the join is sometimes faintly visible.
Why it matters to a buyer
Abrash is considered a mark of authentic hand-dyeing and handmade production, not a defect, and it is impossible to fully eliminate without switching to uniform synthetic dye lots at industrial scale. It is worth setting buyer expectations around this upfront: a certain degree of natural variation is part of what makes a handmade rug handmade, and tolerances for it are typically agreed on the approved sample before bulk production.