Fabric made of acetate is semi-synthetic, despite its natural origin. Acetate fabric is created from wood pulp cellulose that has been treated with multiple acids. Acetic acid, acetic anhydride, and sulfuric acid are examples of acids used in the treatment of acetate fabrics. This fabric is similar to viscose in that they both have a natural and synthetic base. Acetate, like viscose, is a member of the rayon family, as are modal and lyocell.