Does the amount of DPD powder added to the sample affect the test accuracy? TFT's instructions call for "one heaping scoop" while Taylor's instructions call for adding "two dippers".
The dipper isn't the most precise measuring instrument.
Also, does it matter if you mix vigorously (shaking the sample bottle with the top on) or just gently swirl?
Finally when using the 10ml sample I get a fade to a light pink right before the last drop. The last drop makes it completely clear. Is that an indication that I should count the last drop as something less than a whole drop? I am mainly concerned about the CC part of the test.