Cyanotype is a very simple photographic process. It involves treating a surface chemical solution that reacts with UV light;
Ammonium ferric citrate and Potassium ferricyanide. The two separate solutions are made and then equal quantities of each solution is mixed together in a third container. The Process
1. Mix the chemicals. Your floors, carpets, walls, work surfaces, clothes and skin can be stained by the chemicals. Cover all possible areas, use rubber gloves and an apron or an old shirt to work in. If you have the space, choose an area where you can spread out. 2. Preparing the surface. Using a brush, simply paint the chemicals onto the material. Paper, card, textiles or any natural material can be used to print on. Make sure your working area is dimly lit, or lit with a low-level tungsten bulb. Once the material is coated, leave it to dry in the dark or you can speed up the process with a hairdryer. 3. Printing the cyanotype Print a cyanotype by placing your negative (to reproduce a photograph) or object (to make a photogram) in contact with your coated paper or fabric. Sandwich it with a piece of glass. Expose the sandwich to UV light. Natural sunlight is the traditional light source, but UV lamps can also be used. A photogram can also be made by placing items on the surface. Plants, decorative items or other objects can be used to create silhouettes or interesting shapes. Exposure times can vary from a few minutes to several hours, depending on how strong your light source. 4. Processing and drying When the print has been exposed, process your print by rinsing it in cold water. The wash also removes any unexposed chemicals. Wash for at least 5 minutes, until all chemicals are removed and the water runs clear. To speed up the oxidation process,wash in a hydrogen peroxide solution, for a deep blue print. |
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