Attaching artwork (a photo, print, document or paper) to the back of a mat is called "hinging" by picture framers. This is very different to "taping". A picture showing a hinged photo is shown at your left. Another image in another page document taped to a mat. The blog also explains why taping artwork to a mat is a bad idea. We recommend hinging instead. Hinging means .. attaching the art to either the backing board of the picture frame (as shown in the picture) or the back of the mat (not shown in the picture) using 2 hinges (short tape sections) of "hinging tape". This is a special, acid-free pressure-sensitive tape carried by most picture framers. Hinging, instead of taping, allows for expansion and contraction of the artwork during the seasons. If the artwork is taped, the artwork is too rigidly held and not allowed to expand. If this happens the photo, print ... poster, document or paper may tear, or ripple, or cockle under the glass. Broadly speaking, there are two main methods of hinging. The first one, and most common, is hinging the artwork to the back of the mat. Picture framers often use good quality, pressure-sensitive tapes such as Lineco Self-Adhesive tissue and Tape. These come in handy, tearable, dispensing boxes and are easily applied but burnishing the tissue or tape with your fingers. To hinge your art to the back of the mat, put your art ( print, image, photo, document, etc) down on a your work table. Make sure that the top of your art hangs off the edge of the table a few centimetres. Lay the mat on top of the art and centre it. Then attach two pieces of hinging tissue or tape to the art. Lift the mat up and stick it the back of it to the two hinges hanging of the art. Press gently and burnish the two hinges to make sure these don't come undone. That is it. it's done. One advantage of this hinging method is that the artwork will stay in the centre of the window mat opening and it will not need re-positioning. A possible disadvantage of this hinging method is that it may be a little difficult, but not impossible to later re-position the artwork or change the mat. The second one, and less common, is hinging the artwork to the backing board. Again, the same hinging materials mentioned in the previous hinging method can be used as well as the Gummed Linen Hinging tape. This gummed tape has to be water activated and has to be used with care, lest water o moisture be inadvertently transferred to the artwork. To hinge your art to the backing board, place you artwork on your work table face up. Then tear off two small sections of the hinging material and apply them to the very top edge of your art, without unduly intruding into the image or your art. Press and burnish, making sure the two hinging tabs overlap the art. Now position the mat's backing board under the art and centre it. Press and burnish the centred art to the backing board. Then place the mat on top of the image, centralizing it, with their top edges parallel. With this done, cut or tear a section of linen tape nearly as long as the mat and attach it along the edges of the two boards. Lastly, just fold the mat up and over the backing board so that it is positioned centred on top of your art. And that is it, the mat, art and backing board sandwich is ready for fitting up to the picture frame.