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How do I know if non-uniformities are due to the platesetter, the pre-heat oven or the processor?

April 26, 2017Oven platesetter pre-heat processor

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How do I know if non-uniformities are due to the platesetter, the pre-heat oven or the processor?

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Try the following: expose 2 plates identically then rotate one plate 180 degrees before it enters the pre-heat oven. Expose a plate conventionally (with a film negative) and compare the results to digitally imaged plates. Process a non-exposed plate and look for “thermal fog.