It wasn't that I was waiting a minute or two for any reason...I just did the test and then went to rince out the containers and it was pink again. I know the pool is under attack as it uncharacteristically stinks of chlorine to high heavens, but does not show any CC until after several minutes. I wasn't sure if those were true results or not. It seems as though my samples turn pink again after checking FC and also the CC test if I don't toss them right away. I was wondering if my supplies might have gotten cooked in the hot sun by FedEx and this was unusual.