Most reproductions show unusual printing patterns not found in originals. Making an exact copy of an original is very difficult. During the copying process, unavoidable and unwanted patterns may occur. These unpredictable patterns vary from copy to copy. They can be seen without magnification.
Reproductions typically lack details in shadows or dark areas.
Pay particular attention to details printed in shadows or dark colors. Most reproductions 1look cloudy, smudged or blurred in areas where shadows or dark colors appear. The diagonal lines in Fig. 2 were created when the original was copied. Keep in mind you are not looking for specific patterns, but rather unusual or illogical patterns. A closeup of the same area in the original is shown in Fig. 3 for comparison.