Which of the following indicates a passed coin test?

a. No image of a coin
b. A faint image of the coin
c. An undistorted image of the coin
d. A dark image of the coin

a. The coin test places a coin on an unwrapped film under safelighting conditions. It is assumed that while the film is on the counter, the portion of the film that remains under the metal coin will be protected from possible light exposure, while the rest of the area would receive exposure if the light was unsafe. Therefore, a failed test will image the outline of the coin.