Response to FP 4 in Rodinal

You can increase the sharpness and grain using D76 buy simply diluting it 1:3. This will increase the graininess somewhat, but improve sharpness. The reason is that that sodium sulfite in D76 is also diluted so it has less erroding effect on the grain particles; diluting it enhances the edge acutance. Rodinal, which has no sodium sulfite, gives a sharp, though prominent, grain pattern that yields an apparently sharp image. Close examination with a loupe, however, will not show that Rodinal increases resolution at all; in fact, the opposite may be true.

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