Redwork is a form of American embroidery that developed in the 19th century. It encompasses any type of embroidery worked in red thread on white or natural-colored fabric (usually muslin). This style of embroidery is most commonly worked in basic surface embroidery stitches (usually the backstitch) and cross stitch. Redwork has been commonly used in folk embroidery since stable dyes were developed in Turkey (hence the old name of Turkey Work), and was very popular from 1880 through the early 1900's. Common themes of redwork include children, animals and flowers.
Most stitchers use cotton embroidery floss when working Redwork, but other embroidery threads can be used as well, including pearl cotton, linen, bamboo and silk threads. DMC floss in color number 321 is the most popular color used for Redwork.
Redwork patterns can also be worked in blue threads on white fabric, and is then referred to as Bluework.
An interesting site about the history of Redwork and free patterns is at: Red Brolly