Blackwork embroidery is a type of embroidery that is worked in black thread on a piece of white or off-white fabric. The designs are typically geometric and repetitive, and the contrast between the black thread and the light-colored fabric creates a striking effect.

Blackwork embroidery dates back to the 16th century, when it was used to decorate clothing and household items. The technique involves working a series of counted-thread stitches, such as backstitch or double running stitch, in a specific pattern to create the design. The stitches are usually worked in a single color of thread, which gives the designs a monochromatic look.

Blackwork embroidery can be done in a variety of styles and patterns, from simple geometric shapes to intricate floral motifs. The technique is often used to create borders, fills, and outlines in larger embroidery projects, but can also be used to create standalone designs on smaller items like bookmarks or coasters.

While blackwork embroidery is traditionally done in black thread on a white or off-white fabric, modern interpretations may incorporate other colors or fabrics to create unique and contemporary designs.