A material added to a spinning composition before extrusion to reduce the lustre of a manufactured fibre. Note 1: The anatase form of titanium dioxide is commonly used for this purpose. Note 2: Terms used to indicate the level of delustrant in manufactured fibres include: clear. bright, semi-dull, dull, matt, extra dull, and super-dull.

A chemical that is added to a viscose fiber solution that takes away the shine or gloss from the fiber.