Conflicting test results...........

[SunnyOptimism]

It does not matter. The powder is simply the indicator dye that you are saturating the solution with to bind to the FC and cause the pink color change. The titrating reagent is the exact solution that then neutralizes the FC and turns the solution from pink to clear. So the only thing that matters is having a known titrating reagent concentration to set the ppm/drops value.

If you look at the scoop handle, it is printed with 0.05gm. So two level scoops adds approximately 0.1gm of DPD powder which is more than enough to react with all of the FC in your test sample.