H Canister light leak

Even at the processing stage film is very sensitive to the smallest amounts of light. If your processing canister has a small crack or if the funnel-shaped lid is not properly secured then film fogging may occur. If the edges of the film, as well as some of the image area, show signs of exposure then light leak is probably the most likely explanation (see Figure 48.8).

Fault prevention: Preprocessing checks of equipment and careful securing of the processing canister should help prevent this problem from occurring.

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Figure 48.8 Processed negative suffering from light leak.

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