Okay I have a general question about this, I just mixed up a 250ml batch of working solution... I reuse this right? For how long?? I'm processing 4x5 sheets and I just ran a batch of six sheet... still haven't scanned the sheets to check results but... I'm really new to this... Since there are only enough chemicals for 4 batches of 250ml working solutions, can I expect to process 20 sheets or so from each batch of working solution??