If your image is in the computer, this is easy - just do a horizontal rotation of the image. Because you will be transferring the cartoon to the binder, if your image has a "left" and "right" orientation, you must create a reverse image of the cartoon. To help guide laying out the tesserae for your mosaic, you should create a cartoon, which is a full-size line drawing of your image on paper. In fact, using a bare board, either OSSB (Oriented Structural Straw Board) or MDF (medium density fiberboard), can be preferable as it will help the putty dry, which is necessary at the end of the double reverse process. When using lime putty, this isn't as big of a problem because the putty remains pliable much longer. With clay this is recommended because the plastic will also slow down the drying process by preventing the wood from soaking up the water from the clay. You can place a plastic sheet between the bed and the work surface. Using a rolling pin or other cylindrical object, roll out the putty or clay into a uniform bed on a flat work surface. If you want to learn more about lime putty and its special characteristics, visit fresco-techniques. However, lime putty is more expensive than clay. Lime putty also stays softer much longer than clay and is easier to remove once dry. Lime putty is softer than clay and easier to press in and move around the tesserae. There are several consideration when choosing between lime putty and clay. Do not use polymer based modeling clays as these clays are made with oils which leave behind an oily residue that must be cleaned. For small mosaics, you can use water based clays such as that used to make ceramic tiles. Do not use hydraulic lime because it sets in water. For lime putty, use hydrated lime that sets in air. With the Ravenna method, the mosaic is made on a temporary bed of lime putty or clay. You can also visit the websites of these resources directly at Mosaic Art School and MKMosaics. We provided a brief overview of this technique but for a better understanding, we highly recommend viewing the video below from the Mosaic School in Ravenna and reading Michael Kruzich's excellent article describing the Ravenna method in detail. A key advantage of this method is that you can carefully create a more exact mosaic and make changes to it before placing it into its permanent base. The Ravenna method is considered by many to be the pinnacle of mosaic technique. There are many other resources and YouTube videos available and if you know of one that you think would be helpful to our explanations, please drop us a line through our Contact page. We have included links to websites and videos to help with the explanations. They are actually quite straightforward and the names make perfect sense when you understand the method. Below we have done our best to simplify and clarify these methods. Part of this confusion comes from the names - indirect, direct, double reverse. When you are first introduced to mosaics, one of the most confusing aspects can be the different methods.
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