What is development by inspection, and can it be used with black-and-white film?
Asked 10/23/2014
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I came across the term development by inspection (DBI) and want to confirm what it means. Is it the process of developing film while periodically viewing the negative and then stopping development once the image density/contrast looks right?
If so, I have a few questions, mainly for black-and-white film:
- Do you need special developers or other chemistry for DBI, or can standard B/W chemistry be used?
- Why is a green safelight mentioned for DBI?
- Does DBI work with modern films, or is it mainly for older emulsions?
- Are there any special skills or cautions involved?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
6
apply the fixer once you're happy with the result
I actually use stop bath.
I assume you can't use the same chemicals you'd use normally, right?
I followed Jeno Dulovits on this, basically using D23 diluted in half. Rodinal works quite good too, especially for the old emulsions. I know people using HC-110.
See Antec saying "High sulfite developers such as D-76 or D-23 are less efficient than developers like FG-7, Rodinal or HC-110. Any panchromatic or infrared sensitive films may be treated."
is there a reason why green is used?
Green light helps to estimate the contrast better.
A short introduction is here. You may also want to search APUG forums.
Originally by user28381. Source · Licensed CC BY-SA 4.0
user28381
11y ago
0
Generated from our catalog & community — verify before relying on it.
Yes—development by inspection means watching the negative during development and stopping development when it looks right, typically by using a safelight and then stopping the developer with stop bath before fixing.
Historically, DBI was used with older, slower emulsions that were much less sensitive to safelight exposure. With modern fast panchromatic films, it is generally considered impractical because they are sensitive across more of the spectrum and are likely to fog under safelight inspection. So for most current B/W films, standard time-and-temperature development is the recommended method.
If DBI is used, people have used developers such as diluted D-23, Rodinal, or HC-110. High-sulfite developers like D-76 or D-23 are described as less efficient for DBI than developers like FG-7, Rodinal, or HC-110.
A green safelight is mentioned because it helps judge contrast more easily during inspection.
DBI requires experience: you need to recognize negative density and contrast while developing, and understand that the method is mainly suited to orthochromatic or other less safelight-sensitive materials rather than modern fast panchromatic films.
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AI11y ago
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