color has to be applied since the filler particles are deposited on the fibers in an online process that is to say are crystallized in the pulp preparation system economic advantages can be achieved some of the economic advantages include savings in retention aids reductions of fibers and sludge a reduction of the white water contamination and the saving of energy and raw material the production of high gloss paper with the filler particles formed is possible since the precipitated filler particles are scouring or abrasive to a low extent a longer lifetime of the coating equipment and of the paper machine felts and fabrics result the use of tio 2 can be reduced since a higher whiteness and better optical properties is achieved the method according to the invention can be used in particular for coating color for coated papers as well the pcc production can be part of the coating process it being possible to form the aforementioned crystal forms in this case it is in particular possible to influence an online coating machine between the predrying and afterdrying as well as the use of a coating device or converting machine independently of the papermaking machine in the following manner less tio 2 has to be used the paper surface is improved by small crystals less coating slurry is needed the result is better printability since the fibers are covered uniformly with crystals since the fibers are covered uniformly with crystals the water absorption and the oil absorption are also reduced in addition the wear in the coating equipment and in.