Works on paper are hinged to an acid-free board. This is a museum method of attaching artwork in place. The hinges can be removed at any time without causing damage to the work of art. Hinges allow naturally occuring expansion, and contraction of the art without resulting in distortion. Photographs can be hinged, or secured with photo corners. Textiles generally are secured onto a fabric covered board using apppropriate threads. For works on canvas, whether acrylic paint or oil, a high quality stretcher frame is recommended.