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Old 16th September 2021, 11:02 AM
Martin Aislabie's Avatar
Martin Aislabie Martin Aislabie is offline
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Location: Stratford-upon-Avon, England
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I think pretty much all developer manufacturers recommend a couple of sharp taps of the tank into a hard surface after the developer has been poured in the first set of inversions carried out.

Personally, I always do them after every set of inversions - just on the off chance.

I recently developed some roll film for the first time in ages (most of my film is 5x4) and missed tapped the tank on to dry hard surface but rather tried to tap the tank on to the bottom of a sink that had perhaps 6 mm of water in. The water acted like a cushion/shock absorber and I suffered air bell marks on my film for the first time in over 40 years. The subsequent inversions were tapped against a hard dry surface but it seems the damage was done.

Martin
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