My PC-512 Borax Developer

[Alan Johnson]

Do you throw away the mixed developer after 1 film or can you save it a while and develop a 2nd film later? Do you have to extend the total development time for the 2nd film? How many films in theory could be processed before development times are not practical or the working solution is exhausted?

It's a one shot developer.
They are not recommended for re-use.
Even for one shot Rodinal 1:50 users have reported variations in negatives from re-use.

 

[Andrew O'Neill]

For the sake of consistency, I always treat one-shot developers as one-shot. And... mixing up developers from scratch is cheap.

 

[grahamp]

The chemistry runs to around $0.30 (USD) per 35mm roll, or maybe $0.47 if I add distilled water at supermarket prices. That's about 5% of the cost of a roll of Ilford film. Personally, I don't think the effort is worth it to try to maintain consistency.