Response to Minimum amount of Rodinal

Actually, every compensating development technique I know relies on controlled exhaustion as the mechanism. That is, you want the developer to exhaust in the highlights but keep working in the shadows. Its also a good idea to distinguish between using a developer that is 'in a state of exhaustion' from using a developer 'to exhaustion'. The former typically refers to using a developer one-shot but the developer is compounded to be in a state of exhaustion (a good example is POTA - it is in a state of exhaustion from the moment it is compounded). The latter refers typically to reusing a developer till it reaches exhaustion. The latter is problematic for ensuring consistency because the composition of the developer changes in addition to its getting exhausted (repeated development adds bromide to the solution etc which is likely to affect speed in addition to the maximum density obtainable etc). OK, that's my pedantry fix for this morning. Cheers, DJ.

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