The article describes three strengthening methods; the materials used, the working operation and their effect. 1) Leafcasting. A very thin web of fibers, previously dyed according to the colour of the object, is produced in the leafcasting machine and is laid on both surfaces of the brittle object in a wet state. This method is superior and quicker to traditional hand-restoration using Japanese paper and starch paste, because when leafcasting, one can fill missing areas and strengthen the paper at the same time. Besides, the result seems to be most appealing from the aesthetic point of view. 2) Paper splitting. The brittle object is split into two parts, using gelatine-coated filter paper as support. Then a core of Japanese paper is put between the two parts using starch paste, methyl cellulose etc., as adhesive and the support paper are removed. This method has a good strengthening effect, but the objects are subjected to heavy treatment. 3) Laminating. A Japanese paper commercially coated with an acrylic is heat-set on the surface of the object. The strengthening effect is quite good. For objects sensitive to water this method is the only possible choice, but there are aesthetic problems. However, it is the quickest of all the methods.