Piece dyeing is the application of color from an aqueous dye bath onto unfinished carpet consisting only of primary backing and undyed yarns. Piece dyeing includes beck dyeing in batches of approximately 150 running yards and continuous piece dyeing of almost unlimited sized dye lots. Piece dyeing, either beck or continuous, is generally for solid colors. However, two or more colors can be produced in tweed, moresque, or stripe patterns in the same carpet from a single dyebath. This is achieved by using fibers of modified and/or altered dye affinity. They are available from major producers of nylon and polyester. Included in these dye variants are light , regular, deep and ultra-deep dyeing acid dyeable nylon, cationic dyeable nylon, and polyester, as well as regular and deep dyeing disperse dyeable polyester. Selection of fiber dye variants and appropriate dyestuffs can produce both tone-on-tone and contrasting (cross-dye) colors.

This definition is in context to Carpet. See more contextual defintions for Piece Dyeing.