Quote Originally Posted by sanking
Stock Solution A is good until it turns dark brown or black, and this appears to happen quite suddenly after about six months if there is only a small amount of solution left in the bottle. Full, or even partially full bottles are good for much longer, up to a year or perhaps even more. In any event my experience is that the solution is good as long as it is clear. Stock Solution B should last indefinitely.
Sandy

My solution A was a light brown and produced no density at all on a fully exposed sheet of 5x4 (1:1:100@20c 8.5min). A fresh batch worked fine. Could it be that I put 2x solution B or A in the mix ? I am usually quite methodical with chems but I did mix up a batch in my fixer last week. Fortunatly I saw the error.

Phill

PS I was quite impressed with the 8.5 months