Blackwork, sometimes historically termed spanish blackwork, is a form of embroidery generally using black thread, although other colors were also used on occasion. sometimes it is counted thread embroidery which is usually stitched on even weave fabric. Any black thread can be used, but firmly twisted threads give a better look than embroidery floss. Traditionally blackwork is stitched in silk thread on white or off white linen or cotton fabric. sometimes metallic threads or coloured threads are used for accents.scarletwork is like blackwork, except it is sewn with red thread.