I'm testing for CC using the Taylor K-2006C kit. When testing for CC I add the 5 drops of 0003 and the test sample turns a very very light pink. One drop of the 0871 turns it clear. I record that result as .5ppm CC. I sometimes will leave that test sample as is while I conduct other tests. It doesn't take long and that CC test sample turns pink again, a deeper pink than it turned when I originally added the 0003 for my CC test. What does that mean, if anything? Is my original .5ppm CC result still valid?