Dye that has migrated from one colored area of a rug into the neighboring areas, for example after a professional wash or after a liquid spill that was not properly dealt with. Older rugs that have been washed several times are checked for it in particular. A rug with no color run commands the best price, while a significant run is a serious flaw that can rule a rug out at inspection. It is damage, unlike abrash, the natural shade variation of handmade rugs.
An age class for rugs that are no longer new but not yet antique, in trade usage typically no older than about 60 to 70 years, though dealers' cut-offs vary, some counting from about 50 years or stretching the class toward 100 years, and the looser label vintage, applied to rugs of roughly 20 to 90 years, overlaps it. They are priced on the same factors as new rugs (material, design, colors, weaver skill, straightness) plus condition: repairs, color run and how evenly the pile has worn. Because material and labor costs rise every year, a comparable semi-antique rug usually costs less than a new one.