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Triacetate fibre is produced by reacting wood pulp with acetic anhydride. This produces acetate flakes that are then dissolved in a a solvent. This solution is then extruded through very small nozzels and the solvent is evaporated to produce the fibre, which is then spun into yar. It is occasionally combined with wool, cotton or silk to make it stronger. The difference between acetate and triacetate, is the concentration of fibres. Triacetate contains over 92%.