There are two paper mills in Port Huron. Dunn Paper operates a specialty paper mill at the mouth of the St. Clair River just north of the Blue Water Bridge. Domtar also operates a paper mill in Port Huron, located on the Black River. It was originally built in 1888 by the E. B. Eddy Company. The Domtar mill also specializes in specialty papers for the medical and food service industries. Adjacent to the Domtar Mill is the site of the former Acheson Colloids Company. Dr. Edward Acheson in 1908 founded the company, which made a variety of chemical and carbon-based products. The factory was purchased by Henkel and closed in 2010. However, Henkel continues to manufacture ink and carbon products under the Acheson brand.