OK, Hopefully this will be a quicky. I mixed up a batch of Bromophen two and a half weeks ago. While the majority went into brimmed full PET bottles, about a litre went into a half full PET bottle, which I used a portion of two weeks ago. I have now noticed the remainder in the half full bottle has a very distinct pink hue to it. I know that Ilford claim that it will be OK for two months and I do plan to use the remainder tonight, I just want to know if this is the early signs of it starting to oxidise?