I made up 1 litre of stock solution, and developed two 35mm films separately. The second one I added 10% exposure time as Ilford suggests. However, I only used 300ml of dev - that's all that's needed in Paterson tanks as you probably know. I then poured the 300ml back into the fresh stock solution.
How susceptible to this is Microphen? Will I need to adjust dev time again, or will it be pretty much replenished on going back into the fresh stock?
I will probably mix it 1:1 next time, will that make a difference?
Thanks all in advance!