Nowadays there is an increasing requirement in quality production of writing paper as well as printing paper. The main priority is to achieve physical -chemical characteristics which will give us the best quality of printing. Except cellulose fibers in a paper coat there are many other organic and inorganic compounds that are added in the paper coat. They have a role of fillers, adhesives, pigments, binders, etc… The life-cycle of used paper is relatively short. Therefore, the fibers are often reused or recycled in the paper production. But, all the above mentioned added compounds in the paper coat make paper recycling more complicated. Namely, it is well known that the coat papers are hard to remove from paper pulp. Therefore, in this thesis the research is conducted that is focused on analyzing the influence of hydrogen peroxide on Fedrigoni coated print paper in gloss and mat forms. The research is conducted by changing concentration of hydrogen peroxide, time and velocity of mixing. Afterwards, a loss of mass and percentage of calcium carbonate are measured. The two groups of analysis are done. One group of analysis was with rinsing the soaked sample with distilled water and the other group was without rinsing.