Gast
Hello
Does anyone know what the yield is for a 2% borax solution?
Do you have to discard it straight away, or can you develop several films with it?
cfb_de
Hello Frank (?),
I suppose I’m one of the few who actually *measures* the complete utilisation of a bath using control titration... but: given the potentially huge cost of a 2% borax solution, even I’d be too lazy to bother. The same goes for the homemade citric acid stop bath: just pour it in and off you go!
Thinking about how to use it up costs more than making a fresh batch.
Can you even pour the stuff down the drain?
Best regards,
Franz
Gast
To put it another way.
Is it possible (I always develop two roll films in a 500 ml tin)
to run a fourth or fifth, or even a seventh,
through the same development batch, because borax costs money too!
cfb_de
Hi Frank,
At a price of €2.15/kg (Köler Chemie, 25 kg for €53.75), the borax bath is negligible in terms of cost: 4.3 cents per litre.
I don’t know where you source your raw chemicals, but you’re clearly paying too much. Even when buying small quantities of 5 kg (e.g. from Riedel-de-Hän or Omikron), I don’t end up paying more than 20 cents per litre.
And in my opinion, the risk of a solution that’s no longer fresh isn’t worth it; the first botched film would already cost the equivalent of several litres of borax solution. I certainly won’t be trying it out.
Best regards,
Franz
