I bought carpet last year and want more of the same carpet in an adjoining area. They told me it might not match. Why not?

Carpet purchased at different times may come from different dye lots, which can lead to noticeable differences in color—even if the product name and color appear the same. A dye lot refers to a batch of material that has been colored at the same time using the same dye mixture.

All items from the same dye lot will have consistent coloring. When a new batch of dye is mixed, it creates a different dye lot, which may result in slight color variations. For the most consistent look, it’s best to purchase all carpet for a project at the same time. 

The same is true for other products as well. Tile can have a dye lot. Even natural wood and stone products manufactured at different times can come from a different source causing slight variations in color.