Cellulosic plastics are produced by the chemical modification of cellulose. Cellulose esters are prepared by reacting cellulose with particular acids and anhydrides. Most cellulosic plastics also contain a variety of additives to produce desirable physical properties. Cellulose nitrate, developed in the late 1800s, was the first cellulosic material. Cellulose acetate was developed in the 1920s. This became the first thermoplastic to be injection molded. Cellulose acetate butyrate and cellulose acetate propionate were developed in the 1930s and 1940s. Today, cellulosics are noted for their toughness, surface gloss, clarity, and ability to be processed by a variety of methods. Applications include tubular packaging, tool handles, outdoor signs, and a wide range of consumer products.