The paper industry accounts for a significant share of the chemicals consumed by the industrial sector. Most of the chemicals used are additives, i.e. chemical substances added during pulp and paper preparation and final product manufacturing (conversion and printing) in order to facilitate the process itself as well as the quality or functionality of the final product. Such additives may be re-introduced to the paper production process once waste paper is recycled, leading to their accumulation and spreading in newly manufactured paper and board products. This study aimed at identification of the critical additives potentially present in paper products and quantification of a selected group of additives (Mineral Oil Hydrocarbons) in waste paper and board source segregated from Danish municipal solid waste.