Cellulosic Ester Resins - Chemical Names: Cellulose Acetate (CA), Cellulose Triacetate (CA), Cellulose Acetate Butyrate (CAB), Cellulose Acetate Priopionate (CAP). are produced from cellulose fibers derived from plant sources. They start clear and can be colored. These can be resins that are moldable on their own. They can also be formulated as modifiers and additives to impart properties into compounded resins. Typical uses are as binders and film formers in paints, inks, and other coloring and coating applications. Wikipedia Link