Blackwork is a form of embroidery generally using black thread, although other colours are also used on occasion. Sometimes it is counted-thread embroidery which is usually stitched on even-weave fabric. 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. Blackwork embroidery dates back to the 16th century when it was used to embellish fine clothes.