I read the instruction that came with the kit (TF-50) and did the CH test. The instruction did not say to swirl after each drop when add the R0012. At one point, the lower portion turned purple but the top was still red and I kept adding until the whole thing turned to purple and then blue. That was 40 drops of R0012. I decided to swirl after each drop of R0012, it only took 30 drops. I didn't know I was supposed to swirl for each drop of R0012 until I read the instruction here. If it makes such difference I wonder how the instruction of the kit missed it. Before I started swirling, I re-read the instruction several time but it sure didn't mention to.
My question is why it there a need to test for CC or TC if you know your FC?