Diafine was a popular two-bath black-and-white film developer used in darkroom photography. It allowed photographers to develop many different films with less concern about exact time or temperature control.
Its biggest advantage was simplicity and flexibility. Film soaked first in Solution A, then in Solution B, where development actually occurred. Diafine was known for:
- Consistent results
- Good shadow detail
- Increased effective film speed
- Long chemical life
- Easy processing for mixed film types
Many photographers used it for street photography, journalism, and low-light work because it could help films perform well at higher ISO settings.