To make way for Perceptol I threw away the remants of my ID11 today. The stock solution was made up in mid July 2004 so was about 17 months old. My understanding is that even in a compressed concertina bottle, using ID11 stock solution at anything over 12 months is risky.
As I recall it when it was made up it was a pale straw colour, similar to white wine. Well it came out the same colour. Is this proof absolute that I have thrown away good ID11 or is colour not a satsifactory test. If so is there anyway to test a stock solution other than taking a chance and using it. Given that most negs are not easily repeated this could be a big gamble if it is the only test.