Have Taylor K-2006 test kit and I think I may be interpreting the color change for the CH test incorrectly.
For most of the tests in the kit, it's very easy to interpret the color change to get good results...
FC - pink to clear
TA - green to red
Salt - yellow to salmon redish
For me, the CH test color change is a little difficult to gauge or maybe I'm interpreting the color incorrectly. As I add R-0012 reagent, the color goes from red to purple at about 200ppm (20 drops) but I don't really get to blue though I keep adding the reagent, stopping at around 400ppm (40 drops). Should I be stopping the test when the color is purple or bluish purple OR do I continue testing until the color is literally blue??