The term “Abrash” refers to the natural appearance variances of fibers and colors; it is not a flaw.
Sheep have a variety of hair fibers, looks, and hues, similar to how humans can have a variety of hair fibers, appearances, and shades, or how their hair holds a color. The texture of the hair and fibers changes with the seasons.
Because natural dye components are usually slightly variable, different dye lots may differ.
Abrash can be seen in practically every rug, although it is more common in tribal rugs since the plants and insects used to dye the various colors vary. The dye batches for rugs made in cities and factories are significantly larger, and the colors can be more precisely regulated.