Double-sided posters have the same artwork on the front and backside. The artwork on the back is reversed (in lighter shading). Double-sided posters are normally printed on a thicker paper than are the single-sided version. These posters are displayed in "light boxes". Because of the reverse artwork on the back, the double-sided printing gives a more life-like look to the poster when a light is placed behind it.
The doubled-sided poster is the result of a very expensive printing process which involves running the initial negative through at normal colour intensity. The poster is then reversed and run back through the presses at a reduced colour indensity
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