Dye lot

Yarn manufacturers assign each lot a unique identification number and stamp it on the label before shipping.

Although the component elements of a dye lot number are of interest only for internal business recordkeeping, retail yarn consumers have an interest in ensuring that they purchase a given color of yarn from identical dye lots.

[4] This has the advantage of avoiding the dye lot problem, but the yarn is usually a discount grade of acrylic.

No dye lot yarn is suitable for practice and some projects, but not to create fine apparel.

Use of the same dye lot or run number may also be important in other applications, such as: Wallpaper, fabrics for drapes and other uses, carpets, flooring, tiles, etc.

A dye lot marking from a yarn label. The dye lot is the large stamped number at top. Other information such as color code has been preprinted in smaller digits.
Skeins of yarn from the same dye lot in sufficient quantity to produce a single sweater.