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How to Test Film Developer (Works for ALL Film Developers)
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17 Views • Mar 17, 2024 • Click to toggle off description
This short video shows how to test film developer to know if the chemistry is good and suitable for use. This process tests how long an exposed strip of film takes to turn black when the film chemistry is first mixed and then uses that time as a reference to test aging chemistry against. If the time needed to turn film black increases notably, the chemistry is begnining to weaken and should either be pitched or the developing times compensated.

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Uploaded At Mar 17, 2024 ^^


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RYD date created : 2024-03-17T15:04:37.599159Z
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@dovydaskaminskas4227

2 months ago

It's not all. I do similar test to calculate development time. That can be useful if you experiment, or for example use strange not standard film, or adjust film chemistry, or work not standard temp, or suspect that the developer maybe going bad.
You cut a small peace of film, put half of it in developer and measure time until the wet peace starts to darken and gets to similar shade as the dry peace. The time may be anywhere from 10s to couple of minutes. To get development time multiply your measured time by 17.5.
And I trust this method more than any other recommendation of development time.
For example, recently I tried out D-19 on old expired fogged film. Every source on internet, even the Cookbook recommended 6min. Mine test showed 3mins. Then did the other test with small peacess that was developed from 2 to 8 minutes, and found out that after ~3minutes of development, the film reach its max density.
Developed for 3mins, it came out perfect.

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@coryfromphilly

6 months ago

This works for both B&W and C41 or just B&W?

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