Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


Different carbons deink to different brightness values. Deinking paper printed with inks composed of constant vehicles and different carbon pigments yielded a brightness range of 13.5 points.

General trends indicate that deinkability improves as carbon particle size increases and as structure level decreases. These trends are not conclusive, however, and significant variations from these trends were detected. It . appears that the product of carbon particle size and structure level is more closely related to the final brightness than either particle size or structure level alone.