"Embroidery thread is yarn that is manufactured or hand-spun specifically for embroidery and other forms of needlework.
Threads for hand embroidery include:
Crewel yarn is a fine 2-ply ...
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yarn of wool or, less often, a wool-like acrylic.
Embroidery floss or stranded cotton is a loosely twisted, slightly glossy 6-strand thread, usually of cotton but also manufactured in silk, linen, and rayon. Cotton floss is the standard thread for cross-stitch. Extremely shiny rayon floss is characteristic of Brazilian embroidery. Historically, stranded silk embroidery threads were described as sleaved or sleided in the sixteenth century." - (en.wikipedia.org 13.02.2022)