If I remember correctly, you need to cut the tip off of the cap. At my age, its hard to remember what I had for breakfast or if I even had breakfast.
The CH test starts pinkish, then might go purple, might go indigo blue, but ends at sky blue. It takes a lot of mixing. A whole lot of mixing. If it was purple at 7 drops, it probably would have been blue by 10. I'd repeat it. You have plenty of reagents, since CH doesn't need checking often. Just so you know....
Everything was pretty intuitive, but the CYA test did not make sense. I did it 3 times to make sure. I could still barely make out the dot when the view tube was full. As I stated earlier, a 10 lb of "shock" was added to the pool by the pool company. I added a 5 lb of "Super Shock" and 8 lbs of BioGuard Smart Shock. At a minimum, shouldn't my CYA be like ~25?
Just to reiterate the test, i filled the mixing bottle up to the label with pool water, filled to the top of the label with R-0013, mixed together and let sit for 30-60 seconds. Mixed it again, and then poured the mixture into the CYA view tube. Did I do anything wrong? One issue I had is with the mixing bottle. Am I supposed to be able to pour the mixture out of the top? After I took the red cap off, I couldn't squeeze anything out so I unscrewed the cap and poured it that way.
And to answer your question, the black dot was gone when the tube was full in 2 of the 3 tests.