This may be one cause of non-removable stains. When to bleach Bleaching is considered a cosmetic treatment in textile conservation. The bleaching process runs counter to the basic tenets of conservation of stabilization and preservation in that bleaching of any type usually weakens the fiber structure. Bleaching is not a recommended procedure if only the long term stability of the textile is under consideration. Nonetheless, bleaching for cosmetic reasons is practiced for both private clientele as well as for museum display.
People viewing textiles have inherent expectations.
Usually, a certain amount of yellowing and staining in an old textile is tolerated, as these are signs of age and use, and form a valid presentation for antique textiles. In certain instances, however, stains can be so numerous or dark as to be distracting. Large stains may also blot out important design features necessary to interpret the textile properly. These, and other points should be considered before a decision is made to bleach. The conservator is best able to judge the physical condition of the textile and the possible success or failure of the bleaching procedure.