The accelerated aging of unplasticized cellophane film specimens was conducted at temperatures ranging from 80 to 150°C in a dry, forced-air convection oven for various periods of time. Cellophane was selected because it is regenerated cellulose, is transparent, and is manufactured to very close tolerances. Colorimetric evaluation showed increasing discoloration which could be partially reversed by rinsing in deionized water. The infrared spectra of samples aged within this temperature range show the same changes, dependent upon aging time. This indicates that the species formed in the films at temperatures above and below the boiling point of water are the same, and that the moisture content of the films may affect the reaction rate, but not the mechanisms. The observed data in the visible region fit the standard pseudo-first-order kinetics model and are in excellent agreement with those determined for both the color change of cotton and the ultraviolet absorbance of cellophane under similar conditions.