Embroidery thread is yarn that is manufactured or hand-spun specifically for embroidery and other forms of needlework. Embroidery thread often differs widely, coming in many different fiber types, colors and weights. Threads for hand embroidery include: Threads for machine embroidery are usually of polyester or rayon (less often cotton or silk). Threads, like textiles, can contain compounds that may be harmful to humans. Many dyes have been shown to be allergenic and in some cases carcinogenic. Testing for the presence of these dyes, and other residual substances, can be done at many commercial laboratories. Certification to the Oeko-tex standard may also be applied for. This tests the component for over 100 different chemicals and certifies the component according to human ecological safety.

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