film - What is development by inspection (DBI) and how is it done?

While reading this answer I noticed the DBI concept.

If I understand correctly, the idea is to develop a film while being able to see the progress (and apply the fixer once you're happy with the result).

• Is that what it means?

If so:

• I assume you can't use the same chemicals you'd use normally, right? (I'm more interested in B/W, if it makes a difference)


• A green filter is mentioned; is there a reason why green is used?


• Any other relevant skills or knowledge needed to do DBI?

Answer

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.